Atlanta Pest Calendar: What to Expect Each Month

Why is Atlanta's pest season so long?

Atlanta has hot, humid summers and mild winters, with rain spread across the year. Hard freezes happen on some nights but are usually brief, so outdoor insects slow down for days rather than months. That is why the pest season here runs much of the year instead of stopping at the first frost.

In a city with a deep winter, a freeze can reset the calendar. Insects die back, the ground locks up and a technician can take a few months off from outdoor work. Atlanta rarely gets that reset. Cold snaps come and go, an ice storm or a bit of snow arrives now and then, and then a warm week follows. Pests that shelter in crawl spaces, wall voids and attics barely notice the weather outside.

Two local features lengthen the season further. The first is canopy: Trees Atlanta's 2023 report puts roughly 45 percent of the city under tree cover (45.5 percent, down from 47.9 percent in 2008). Shade holds moisture, leaf litter shelters roaches and ants, and limbs reach roof lines. The second is housing. Many in-town houses from the 1880s to the 1930s sit on brick or block piers over a vented crawl space, which is a damp, dark void that suits termites, rodents and American cockroaches whatever the month.

So when you read the calendar below, treat the months as a guide to which pest is climbing, not a guarantee that a pest is absent the rest of the year. The timing shifts with each warm or wet spell. Our general pest control page explains how a year-round plan is usually built around this.

What pests are active in Atlanta in winter, December through February?

Winter is the quietest period outdoors, but indoor pests carry on. Mice and rats stay inside, German cockroaches keep breeding in warm kitchens and bathrooms, and attic rodents remain active. A warm spell in February can wake carpenter ants and send termite scouts toward damp wood.

December and January are when the house itself becomes the habitat. Mice and rats move along walls, behind appliances and through crawl-space vents, and the sound of scratching in an attic or ceiling is often the first sign. German cockroaches, which live indoors rather than outdoors, do not care what the thermometer says. They are most often a problem in apartments, restaurants and other multi-unit buildings, where a single infested kitchen can feed a whole building.

A hard freeze on a given night may slow outdoor insects for a few days, but it does not end the season. By February, a run of warm afternoons can bring carpenter ants out of damp wood, and termite scouts may start probing toward wet sills and piers. This is a good time to look at what is happening below the house, because the crawl space is easier to inspect before spring growth and swarmers arrive.

If you only do one winter task, walk the outside of the house and look for gaps where pipes and wires enter, loose soffit boards and vents with torn screens. Those are the same openings rodents use all year. The rodent control page covers what a technician checks, and cockroach control covers the indoor roaches that keep going through the cold months.

What happens in spring, March through May?

Spring is when Atlanta's outdoor season restarts. Termite swarm season often begins on warm days after rain, ants emerge, carpenter bees drill bare wood trim, and fire-ant mounds appear in sunny lawns. By May, mosquitoes ramp up, yellowjackets and paper wasps start building nests, and ant trails appear indoors.

March is the start of termite swarm season in many years. Eastern subterranean termites send out winged reproductives, often on a warm day following rain, and a handful of insects on a window sill is the typical first sign. April tends to be the busiest stretch. Our guide to termite swarm season in Georgia explains how to tell swarmers from flying ants.

April is also when carpenter bees start drilling round holes in bare wood trim, fascia and porch rails, which is common on older houses with unpainted or weathered wood. Fire ants rebuild mounds as soil warms, and the sunny lawns of mid-century ranches suit them. See fire ant control for how mounds are treated.

By May, mosquito pressure climbs, and the first wasp nests start as small paper cones under eaves and porch ceilings. Ants also become more visible. Odorous house ants and Argentine ants trail indoors after rain, usually to a sweet or greasy food source. Early-season nests are small, which makes spring the easiest time to deal with a wasp problem before it grows. The ant control and wasp and bee removal pages cover both.

• March: warm days after rain can trigger the first termite swarms; vents and crawl-space openings are worth checking.
• April: peak termite swarmers, carpenter bees at bare wood, new fire-ant mounds.
• May: mosquitoes ramp up, wasps start nests, ant trails appear in kitchens.

What happens in summer, June through August?

Summer is the peak for mosquitoes, wasps and roaches. Heat and afternoon thunderstorms push American cockroaches indoors and fire ants toward houses, fleas and ticks rise in wooded yards, and wasp and yellowjacket nests reach their largest size in August. Spiders are common in sheds and crawl spaces.

June and July bring the combination Atlanta is known for: heat, humidity and storms that arrive in the late afternoon. American cockroaches, often called palmetto bugs, live outdoors and in crawl spaces, drains and leaf litter, and heat or heavy rain can send them inside. If you are seeing one in a bathroom, our guide on palmetto bugs in an Atlanta bathroom walks through why.

Mosquitoes reach their high season. Asian tiger mosquitoes breed in small containers of standing water and bite during the day, which means the problem is often a bucket, a plant saucer or a clogged gutter rather than the creek. Read the mosquito season guide for the yard steps that help.

August is when stinging-insect nests are at their largest. Yellowjackets and paper wasps nest in eaves and ground voids, and a nest that was a golf-ball size in May can be much bigger by late summer. Black widow and brown recluse spiders hide in sheds, wood piles and crawl spaces, so wear gloves when moving stored items. Fleas and ticks rise on pets and wildlife in wooded yards and parks, and the flea and tick control page covers treatment.

• June: heat and humidity, roaches moving indoors, fleas and ticks rising.
• July: mosquitoes, wasps and roaches near peak; storms push fire ants and roaches toward houses.
• August: largest wasp and yellowjacket nests, high mosquito pressure, spiders in sheds and crawl spaces.

What happens in autumn, September through November?

Autumn is when rodents and squirrels look for shelter. As nights cool, they probe soffits, roof edges and crawl-space vents; stink bugs and spiders drift indoors, wasps become more defensive, and mosquitoes may linger well past the first cool night. By November, rodents have usually settled in for the winter.

September can still feel like summer, and mosquitoes stay active. Wasps are at their most irritable because the colony is large and food is changing. The first cool nights, though, start a different clock. Squirrels and roof rats use tree limbs to reach roofs, and a limb that touches or overhangs the roof line is a ready-made bridge to a soffit or attic vent. Read our guide on squirrels and roof rats in Atlanta's tree canopy for how entry points are found and sealed.

October is a good time for a perimeter walk. Look for gaps at roof edges, fascia, dryer vents and where utility lines enter. Stink bugs and spiders come in through the same gaps, and a technician can often find the weak spot in the time it takes to walk once around the house.

By November, rodents settle in, and roaches continue in warm kitchens and crawl spaces. Because Atlanta does not have a hard shutoff, autumn is also the right moment to check the crawl space for damp insulation, loose vent screens and signs of earlier activity. The crawl space pest and moisture work page explains what that inspection involves.

• September: mosquitoes still active, rodents begin looking for shelter, wasps get more aggressive.
• October: squirrels and roof rats look for attic and soffit entry; stink bugs and spiders enter; mosquitoes may linger.
• November: rodents settle in, roaches continue in warm kitchens and crawl spaces.

Atlanta pest calendar at a glance

The table below summarizes the typical pest activity for each month in Atlanta. These are general patterns, not dates: a warm or wet spell can bring a pest forward by weeks, and a cold snap can push it back. Use it to decide what to check and when.

The right-hand column is a prompt, not a checklist you must finish in a month. Pick the item that matches the pest that is rising.

How should you use the calendar in practice?

Use the calendar to time inspections and fixes, not to wait for a pest to show up. Check the crawl space before spring, clear standing water before summer, trim limbs and seal gaps before autumn, and keep kitchens and storage dry all winter. A technician can adjust the visit schedule to what your house shows.

Pest plans in Atlanta tend to be built around the long season rather than four tidy visits. A technician looks at the house, notes the foundation type, the shade and the yard, and explains what the visits cover and what they cost before any work starts. The size of the home, crawl-space access and whether you are dealing with an active infestation or only an inspection are what move the price.

Houses on piers over a crawl space have different weak points from slab-on-grade houses. On a crawl-space house, damp soil and wood in contact with the ground attract termites and decay, and vents and gaps give rodents a way in. On a slab house, the weak points are slab edges, plumbing penetrations and mulch or soil piled against siding. The calendar still applies to both. The difference is where the technician looks.

When something does show up out of sequence, say a swarm in January or wasps in November, a warm spell is usually the reason. Call (855) 974-4733, describe what you saw, and a technician can tell you whether it is a seasonal blip or a sign of a problem inside the structure. If the pest is termites, see termite inspection for what a crawl-space look involves.