The Las Vegas Pest Calendar: What Homeowners Should Expect Each Month
Las Vegas does not have one clearly defined “pest season.”
Scorpions, ants, spiders, cockroaches, rodents, pigeons, and other pests respond differently to temperature, moisture, food availability, reproduction, irrigation, construction, and the conditions surrounding each property.
Some pest activity slows during the winter. Other problems move indoors. Warm spring temperatures create new insect activity, intense summer heat changes where pests seek shelter, and fall cooling can push rodents and other pests toward buildings.
That makes pest control in Southern Nevada a year-round process—even though the type and intensity of activity change throughout the year.
This month-by-month Las Vegas pest calendar explains which problems commonly deserve attention during each part of the year, what property owners should inspect, and which preventive steps are best completed before pressure increases.
Pest Activity Does Not Follow an Exact Date
This calendar describes common patterns, not guaranteed start and stop dates.
Pest activity may begin earlier, last longer, or remain localized depending on:
Daytime and nighttime temperatures
Elevation within the Las Vegas Valley
Irrigation frequency
Rainfall and monsoon activity
Landscaping density
Nearby washes or open desert
Construction and land disturbance
Property age and condition
Available food and water
Neighboring properties
Indoor climate control
Pest species
Established populations
Seasonal weather variations
A heavily irrigated property in Henderson may experience different pressure than a dry lot in North Las Vegas. A new development bordering open desert may experience different activity than an established central Las Vegas neighborhood.
The calendar should help property owners anticipate likely changes—not replace inspection or pest identification.
January: Indoor Activity and Winter Inspection
January is generally one of the quieter months for exterior insect activity in Las Vegas. Cooler nights reduce the movement of many insects and scorpions, but winter does not eliminate pest problems.
Climate-controlled homes and businesses can continue supporting pests throughout the year.
Pests to watch for in January
Mice and rats
German cockroaches
Stored-product pests
Spiders in protected areas
Pigeons
Bed bugs
Occasional outdoor cockroaches
Overwintering insects inside wall voids, garages, and utility areas
Rodents may use garages, attics, storage rooms, wall voids, sheds, and commercial utility areas for shelter. German cockroaches remain active indoors when food, moisture, warmth, and harborage are available.
Pigeon roosting and nesting concerns also continue because established birds do not disappear simply because the weather has cooled.
January prevention priorities
Inspect garages, attics, storage areas, and utility rooms for droppings
Check exterior doors and garage-door corners for gaps
Remove unnecessary cardboard and stored clutter
Inspect beneath sinks and around water heaters for leaks
Clean food and grease from hard-to-reach kitchen areas
Check outdoor equipment for rodent nesting material
Inspect rooftops and solar panels for established pigeon activity
Review the previous year’s pest records to identify recurring locations
January is an excellent month for structural inspection because exterior vegetation and insect activity may be reduced, making certain entry points and evidence easier to identify.
February: Prepare Before Spring Activity Begins
February often remains relatively mild, but warming daytime temperatures can begin changing pest behavior.
The exact timing varies from year to year. Sunny walls, landscape rock, protected patios, irrigation boxes, and warm utility areas may support activity before the broader seasonal increase becomes obvious.
Pests to watch for in February
Ants beginning to forage
Spiders around protected exterior areas
Rodents
Pigeons
German cockroaches indoors
Occasional scorpions in warm or sheltered locations
Early landscape pests
February prevention priorities
Schedule a baseline exterior inspection
Correct damaged door sweeps and weather stripping
Inspect irrigation systems before increasing watering
Remove leaf litter and landscape debris
Move firewood and stored materials away from the building
Trim vegetation that touches exterior walls
Inspect utility boxes and block-wall openings
Clean old spider webs from eaves and patio areas
Correct trash and pet-food storage problems
February is the time to complete repairs before spring demand and pest pressure increase. Waiting until scorpions or ants are already entering the home makes prevention more difficult.
March: Spring Insect Activity Begins to Build
March commonly brings warmer days and increased biological activity around Southern Nevada properties.
Ant foraging may become more noticeable. Flies, moths, beetles, crickets, and other insects may begin appearing around landscaping and exterior lights. Spiders respond as prey becomes more available.
Scorpion activity can also begin increasing as conditions warm, although peak activity generally occurs later.
Pests to watch for in March
Ants
Spiders
Crickets
Flies
Occasional scorpions
Outdoor cockroaches
Wasps beginning nest construction
Landscape-associated insects
Pigeons nesting on protected structures
March prevention priorities
Inspect the exterior perimeter for new ant trails
Address insects gathering around exterior lights
Remove early wasp nests when lawful and safe
Clean webs from eaves, patio covers, garages, and light fixtures
Check door thresholds and garage seals
Reduce moisture around the foundation
Inspect landscape rock, planters, and irrigation boxes
Confirm trash containers close properly
Begin documenting scorpion sightings by date and location
Inspect solar panels and roof areas before pigeon nesting becomes more established
Early intervention is valuable because many spring problems are easier to correct before populations, nests, or feeding patterns become established.
April: Ant, Spider and Scorpion Pressure Becomes More Noticeable
By April, Las Vegas properties commonly experience a clearer increase in crawling and flying insect activity.
Warm weather supports greater movement around block walls, garages, landscaping, exterior lights, utility boxes, and building foundations.
This is when many homeowners first become concerned about scorpions, especially if they live near open desert, active construction, washes, mature landscaping, or properties with known historical pressure.
Pests to watch for in April
Scorpions
Ants
Spiders
Crickets
Outdoor cockroaches
Wasps
Flies
Beetles and other occasional invaders
April prevention priorities
Establish or resume recurring exterior pest service
Inspect for scorpions after dark using a suitable ultraviolet flashlight
Correct garage-door corner gaps
Reduce cricket and cockroach activity that may support scorpions
Keep landscape vegetation away from exterior walls
Inspect block-wall joints and utility penetrations
Correct leaking irrigation
Remove unnecessary ground-level shelter
Adjust lighting where insects gather heavily
Avoid leaving pet food outside overnight
Blacklight inspection can help identify scorpion activity, but one inspection should not be treated as a complete population count. Temperature, time of night, weather, season, property access, and surrounding conditions affect what is visible.
May: Scorpion Season Accelerates
May is a significant transition month for pest pressure in Las Vegas.
Nighttime temperatures rise, insect prey becomes more abundant, and scorpion encounters may increase around garages, patios, block walls, landscaping, pools, and interior living areas.
Ant colonies also become more active, while spiders establish webs where prey is concentrated.
Pests to watch for in May
Bark scorpions and other scorpion species
Ants
Crickets
Spiders
Outdoor cockroaches
Wasps
Flies
Pigeons around shaded rooftop areas
May prevention priorities
Inspect sleeping areas after any indoor scorpion sighting
Keep bedding from touching walls or floors where appropriate
Check shoes, towels, boxes, and items stored in garages
Repair accessible door and garage gaps
Remove clutter from garage floors
Inspect pool equipment and irrigation boxes
Reduce insect prey around exterior lights
Correct water leaks and over-irrigation
Keep trees and shrubs from contacting the roof or structure
Maintain scheduled exterior treatment and documentation
Pesticide treatment should not be the only strategy used for scorpion control. Strong programs combine prey reduction, exclusion, habitat modification, monitoring, targeted treatment, and customer reporting.
June: Heat Drives Pests Toward Shelter and Water
June often brings sustained heat and very dry conditions.
Pests may concentrate around irrigation, pools, shaded foundations, plumbing areas, drains, garages, and climate-controlled buildings. Activity may change during the hottest part of the day, with many pests becoming more visible at night.
Pests to watch for in June
Scorpions
Outdoor cockroaches
Ants
Spiders
Crickets
Wasps
Flies
Pests associated with irrigation and standing water
June prevention priorities
Repair irrigation leaks promptly
Avoid chronic overwatering near the foundation
Inspect pool equipment and drainage areas
Keep trash containers clean and closed
Clean spills from patios and outdoor cooking areas
Inspect exterior doors for heat-related warping or seal failure
Reduce insect attraction around overnight lighting
Check garages and utility rooms for pest entry
Keep landscaping trimmed and inspectable
Monitor indoor areas near plumbing and exterior walls
Technician scheduling also matters during extreme heat. Exterior work should be planned with heat exposure, product-label restrictions, equipment performance, and worker safety in mind.
More chemical is not a substitute for correct placement or safe service conditions.
July: Peak Heat and Monsoon-Related Pest Movement
July commonly produces some of the most intense heat of the year. Southern Nevada may also experience monsoon moisture, thunderstorms, wind, and sudden changes in outdoor conditions.
Rainfall does not need to be prolonged to influence pest movement. Water can temporarily flood harborages, alter ant trails, increase moisture around structures, and support short-term insect activity.
Pests to watch for in July
Scorpions
Ants
Outdoor cockroaches
Crickets
Spiders
Flies
Mosquitoes around standing water
Wasps
Pests displaced by storms or runoff
July prevention priorities
Inspect after storms for new ant trails and indoor pest activity
Empty containers that collect water
Correct clogged or poorly draining areas
Inspect door thresholds after wind-driven debris accumulates
Keep garage doors closed when not in use
Monitor areas around floor drains, plumbing, and utility penetrations
Check landscape materials displaced by runoff
Report significant changes in pest activity to the service provider
Avoid adding store-bought spray over an existing professional treatment
Continue scorpion monitoring in high-pressure areas
Customers may assume a treatment has failed when pests appear immediately after weather changes. The correct response is to document the pest, location, and timing so the service provider can determine whether the activity represents an isolated invader, displaced population, untreated entry point, or broader service issue.
August: Sustained Scorpion and Insect Pressure
August often continues the elevated pest pressure established during early and midsummer.
Warm nighttime conditions can support scorpion activity. Ants may remain active around irrigated soil, kitchens, bathrooms, pet areas, and exterior landscaping. Cockroaches and crickets may move between utility systems, irrigation areas, garages, and buildings.
Pests to watch for in August
Scorpions
Ants
Spiders
Crickets
Outdoor cockroaches
Flies
Wasps
Mosquitoes where water accumulates
August prevention priorities
Review where scorpions have been found during the summer
Inspect recurring entry areas rather than treating every sighting as unrelated
Correct door-sweep and garage-seal failures
Reduce dense storage along garage walls
Inspect irrigation and meter boxes
Remove debris that creates ground-level shelter
Correct pet-food, trash, and moisture sources
Keep vegetation from overgrowing the foundation
Review whether service frequency matches property pressure
Schedule targeted follow-up for persistent activity
Recurring indoor scorpion sightings deserve more than repeated spot spraying. The structure, prey population, garage, roofline, utility penetrations, exterior habitat, and surrounding properties should be evaluated together.
September: Continued Heat With Early Seasonal Transition
September can remain extremely warm in Las Vegas, so summer pests do not necessarily disappear when the calendar changes.
Scorpions, ants, spiders, and outdoor cockroaches may remain active. As nights gradually cool later in the season, pest behavior and harborage selection can begin changing.
Pests to watch for in September
Scorpions
Ants
Spiders
Outdoor cockroaches
Crickets
Wasps
Flies
Early rodent movement around buildings and storage areas
September prevention priorities
Continue summer pest monitoring
Inspect garages and storage areas before fall organization projects
Remove unused cardboard and stored materials
Check exterior doors before cooler weather arrives
Look for rodent droppings around sheds, equipment, and garages
Trim vegetation and remove accumulated debris
Inspect rooflines, vents, and utility penetrations
Correct trash and food-storage conditions
Document locations with repeated summer pest activity
Plan fall exclusion repairs
September is a valuable month for reviewing whether summer service produced a sustained reduction or merely addressed individual sightings.
October: Rodent and Overwintering-Pest Prevention
October generally brings more comfortable temperatures and a noticeable seasonal transition.
Exterior insect pressure may begin declining as nighttime temperatures cool, but the property should not be left unprotected. Rodents may investigate garages, attics, sheds, warehouses, storage areas, and landscaped edges for shelter.
Spiders and occasional invaders may also move into protected spaces.
Pests to watch for in October
Mice and rats
Spiders
Ants
Cockroaches
Occasional late-season scorpions
Stored-product pests
Pigeons
Insects moving into protected areas
October prevention priorities
Inspect attic, roof, vent, and garage access points
Look for droppings, gnawing, rub marks, and nesting material
Seal appropriate utility penetrations
Replace damaged door sweeps
Inspect garage-door seals
Remove fallen fruit and accessible pet food
Secure birdseed and animal feed
Clean storage rooms and shelving
Move boxed goods off floors where practical
Inspect outdoor cooking and food-storage areas
Rodent exclusion should be performed carefully. Openings involving roofing, electrical service, ventilation, drainage, fire protection, or structural components may require coordination with another qualified trade.
Trapping without correcting entry points may provide only temporary relief.
November: Indoor Pest Problems Become More Important
November commonly brings cooler nights and reduced exterior insect movement. Indoor pests, however, can remain active regardless of outdoor temperature.
Holiday travel, food storage, deliveries, used furniture, boxes, and increased indoor gatherings can create new opportunities for pest introduction.
Pests to watch for in November
Rodents
German cockroaches
Pantry pests
Bed bugs
Spiders in garages and storage areas
Pigeons
Flies associated with drains, waste, or organic material
November prevention priorities
Inspect grocery and bulk-food storage areas
Check flour, cereal, pet food, birdseed, and dry goods
Store susceptible food in durable sealed containers
Inspect used furniture before bringing it indoors
Reduce cardboard accumulation from deliveries
Check guest rooms and luggage after travel
Clean beneath appliances
Inspect garages before storing holiday items
Monitor for rodent evidence
Keep trash and food waste controlled during gatherings
Pantry pests may originate inside an infested product rather than entering through the structure. German cockroaches and bed bugs may also be introduced through belongings, furnishings, appliances, travel, or deliveries.
Accurate identification is critical before treatment begins.
December: Prevention, Documentation and Annual Review
December is often one of the quieter months for outdoor pest activity, but it is an important time for inspection and planning.
Property owners should use service records, customer reports, photographs, monitoring results, and callback history to identify recurring pest patterns.
Pests to watch for in December
Rodents
German cockroaches
Bed bugs
Pantry pests
Pigeons
Spiders in protected locations
Occasional pests living inside heated structures
December prevention priorities
Review the year’s pest sightings and service reports
Identify rooms or exterior areas with repeated activity
Inspect holiday decorations and storage boxes
Check garages, attics, sheds, and utility rooms
Remove unused clutter and cardboard
Correct leaks beneath sinks and appliances
Review door, vent, and utility-penetration repairs
Inspect commercial kitchens and food-storage areas
Evaluate whether the service plan matched actual pest pressure
Schedule structural corrections before spring
The annual review should distinguish between:
Isolated pest sightings
Repeated entry through the same location
Unresolved sanitation or moisture conditions
Specialty infestations
Exterior pressure
Structural deficiencies
Service callbacks
Customer-preparation failures
Conditions originating on neighboring properties
This prevents the following year’s program from becoming a repetition of the same temporary corrections.
Which Las Vegas Pests Are Active Year-Round?
Seasonality matters, but several pest problems can occur during any month.
German cockroaches
German cockroaches live and reproduce indoors. Heated and climate-controlled buildings can support them throughout the year.
They should be treated as a specialty infestation rather than included automatically with routine exterior pest maintenance.
Bed bugs
Bed bugs are transported by people and belongings. Their activity is not controlled by outdoor temperature in the same way as many exterior pests.
Travel, used furniture, adjoining units, and repeated introductions can create problems during any season.
Rodents
Rodent pressure may become more noticeable during cooler weather, but rats and mice can affect properties year-round when food, water, shelter, and access are available.
Pigeons
Established pigeon roosting and nesting can continue throughout the year. The need for deterrence depends more on building access, nesting status, food, water, and site attachment than on a single season.
Pantry pests
Stored-product insects may remain active inside temperature-controlled homes, warehouses, stores, and food facilities during any month.
Commercial pest problems
Restaurants, warehouses, apartments, healthcare properties, food facilities, hospitality operations, and other commercial buildings may support pests year-round because their internal conditions remain relatively stable.
When Should Pest Control Start in Las Vegas?
The best time to begin pest control is before a predictable problem becomes established.
For many Las Vegas homes, late winter or early spring is an ideal time to:
Establish a baseline inspection
Correct door and garage gaps
Address irrigation leaks
Reduce exterior shelter
Begin monitoring
Remove old webs
Evaluate block walls and utility areas
Establish recurring exterior protection
Document existing pest conditions
That does not mean customers who begin service in summer or fall have missed their opportunity. The program should simply be adjusted to the pests, pressure, season, and current condition of the property.
A home with repeated indoor scorpions may require a more aggressive initial program than a home beginning preventive service in February.
Does Las Vegas Pest Control Need to Continue During Winter?
Stopping service during winter may save a small amount in the short term, but it can interrupt monitoring, weaken prevention, and allow structural or sanitation problems to go unnoticed.
A professionally designed recurring program can adjust with the season.
Winter service may emphasize:
Inspection
Rodent evidence
Exclusion conditions
Interior monitoring
Web removal
Garage and utility areas
Moisture problems
German cockroach or pantry-pest evidence
Pigeon activity
Preparation for spring
Summer service may place greater emphasis on:
Scorpions
Ants
Crickets
Cockroaches
Spiders
Irrigation areas
Exterior entry
Nighttime pest movement
Heat-sensitive service planning
Year-round service should not mean performing an identical application every visit. It should mean maintaining continuous oversight while adjusting the work to actual conditions.
When Does Scorpion Season Begin in Las Vegas?
There is no single official start date.
Scorpion activity is strongly influenced by temperature, especially nighttime conditions. Activity commonly increases as spring temperatures rise and can remain significant through the warmer months.
The University of Arizona Cooperative Extension notes that scorpions become active under warm nighttime conditions. That helps explain why Las Vegas encounters generally increase from spring through summer and decline as nights cool.
However, scorpions may still be found during cooler periods in:
Garages
Block walls
Utility boxes
Attics
Wall voids
Heated structures
Protected landscape areas
Stored materials
Homes with established entry conditions
Customers should not wait for a specific month if scorpions are already being found indoors.
How Weather Changes Pest Activity
Extreme heat
Extreme heat may reduce activity on exposed surfaces during the day while concentrating pests in shaded, irrigated, protected, or indoor areas.
Rain and monsoon storms
Rain can flood harborages, alter ant trails, create temporary standing water, and move pests toward higher or drier shelter.
Cooling temperatures
Cooler nights may reduce the activity of some insects while increasing the value of protected building areas to rodents and occasional invaders.
Wind
Wind can damage screens, move debris, disturb nests, and affect flying insects. It can also expose gaps around doors, rooftops, patios, and stored materials.
Irrigation changes
Increasing or decreasing irrigation can change soil moisture, insect abundance, plant growth, and pest concentration around the structure.
Weather may explain a change in activity, but it does not prove where pests originated. Inspection is still necessary.
A Year-Round Las Vegas Pest-Prevention Checklist
Property owners can reduce pest pressure throughout the year by consistently managing the conditions pests use.
Keep the structure inspectable
Reduce clutter against walls
Keep garage floors reasonably clear
Avoid concealing the foundation with dense vegetation
Maintain access to utility and plumbing areas
Store goods off the floor where practical
Control water
Repair plumbing leaks
Correct irrigation leaks
Avoid unnecessary overwatering
Empty water-holding containers
Maintain drainage
Report recurring moisture around walls or cabinets
Control food
Secure trash
Store pet food properly
Clean spills and grease
Avoid feeding pigeons
Store dry goods in appropriate containers
Remove fallen fruit
Maintain outdoor dining and cooking areas
Reduce shelter
Remove landscape and construction debris
Move firewood away from the structure
Eliminate unnecessary cardboard
Trim vegetation
Correct accessible gaps
Maintain door and garage seals
Reduce pest attraction
Manage exterior lighting
Clean webs where practical
Control prey insects
Maintain dumpsters
Inspect deliveries and used furnishings
Keep doors closed when not in use
Document activity
Record:
Pest type
Date
Time
Exact location
Whether it was alive or dead
Weather conditions
Recent irrigation or construction
Photographs
Previous activity in the same area
This information helps distinguish isolated sightings from consistent patterns.
When to Call a Professional
Request a professional inspection when:
Scorpions are repeatedly found indoors
Small cockroaches appear in kitchens or bathrooms
Rodent droppings or gnawing are present
Ant trails return after cleaning
Pest activity involves multiple rooms
A pest cannot be identified
Children, pets, or sensitive occupants increase concern
Bites or stings are occurring
DIY treatments are not producing sustained improvement
Pests are associated with electrical equipment or appliances
Several apartment units are affected
A restaurant or commercial property has recurring activity
Pigeons are nesting beneath solar panels or above occupied areas
Structural openings may be contributing
The same callback occurs repeatedly despite treatment
A reliable professional should explain the pest identity, evidence, contributing conditions, treatment scope, required customer cooperation, expected timeline, limitations, follow-up, and re-service terms.
Seasonal Pest Control Built for Las Vegas Properties
Las Vegas pest pressure changes throughout the year, but it does not disappear.
Winter creates opportunities for inspection and rodent prevention. Spring brings renewed ant, spider, cricket, and scorpion activity. Summer heat concentrates pests around water, shelter, and climate-controlled buildings. Fall provides a critical window for exclusion, cleanup, and preparation before cooler weather.
The strongest pest-control programs respond to those changes instead of repeating the same treatment every visit.
EXO Environmental provides inspection-based pest control for homes and businesses throughout the Las Vegas Valley. Our service plans account for seasonal pest pressure, property conditions, surrounding habitat, irrigation, construction, pest history, and the level of follow-up required.
Not sure whether your property needs preventive service, a seasonal adjustment, or a specialty treatment? Request an inspection from EXO Environmental and build a pest-control plan around the conditions actually affecting your property.
Seasonal and prevention principles referenced in this guide are supported by the National Weather Service’s Las Vegas climate information, National Weather Service 1991–2020 Las Vegas climate normals, University of Arizona Cooperative Extension scorpion guidance, and the EPA’s integrated pest-management principles.
