Seasonal Pest Control Calendar: A Month-by-Month Schedule

Most people call a pest control company after they've already got a problem. By then you're paying emergency rates, dealing with an established population, and probably losing sleep over whatever crawled into your house. The smarter move is knowing what's coming before it shows up.

I ran routes for seven years in the Southeast. The same calls came in at the same time every year, like clockwork. Ants in March. Termite swarmers in April. Mice in October. The calendar doesn't lie. Here's what to expect and what to do about it, broken down by season.

Spring (March through May)

Spring is when pest season really kicks off. Ground temperatures hit 50-60 degrees and everything that's been dormant starts moving. If you only do one treatment a year, this is when to do it.

March: Ants wake up first. Odorous house ants and pavement ants start foraging along foundations looking for food and moisture. This is the month to lay down a perimeter barrier. A pro will use a non-repellent like Termidor SC ($60-75 for the concentrate if you DIY) or Phantom along your home's foundation. Don't use repellent sprays from the hardware store. They scatter colonies and make the problem worse through colony budding.

April: Termite swarm season. You'll see winged termites emerging from soil or sometimes inside your house near windows and doors. Eastern subterranean termites swarm on warm days after rain, usually between 10am and 2pm. Finding swarmers indoors means there's an active colony in or under your structure. Don't panic-spray them. Collect a few in a ziplock bag and get a termite inspection scheduled that week. Most companies do inspections free.

May: Mosquitoes start breeding in earnest once nighttime temps stay above 60. Walk your property and dump every container holding standing water. Clogged gutters, plant saucers, that wheelbarrow you forgot about. One bottle cap of water produces hundreds of mosquitoes every 10 days. May is also when carpenter ants become visible. If you see large black ants (half-inch or bigger) inside your home, that's not a foraging trail problem. That's a nest-in-your-wall problem.

Summer (June through August)

Peak season. Everything is active, breeding fast, and looking for food and water. This is when quarterly service earns its money back.

June: Wasps and yellow jackets are building nests. Paper wasp nests are small and visible under eaves and porch ceilings. Yellow jacket nests are underground or inside wall voids, and they're aggressive. You can knock down a small paper wasp nest yourself with a $5 can of Spectracide Wasp & Hornet Killer from a safe distance. Underground yellow jacket nests? Call a licensed pest control company. Seriously.

July: Bed bug season peaks. Not because of temperature, but because people travel. Hotels, Airbnbs, summer camps. Bed bugs hitchhike in luggage and show up in your bedroom two weeks after vacation. Check hotel mattress seams before you unpack. When you get home, run everything through a hot dryer cycle for 30 minutes. Spiders also peak in July. Brown recluses are most active in attics and storage areas. Black widows hang out in garages, woodpiles, and meter boxes.

August: Wildlife in attics. Squirrels and raccoons that had spring litters are now dealing with juveniles exploring. You'll hear scratching and thumping at dawn and dusk. Roaches are at peak population in warm climates. German roaches in kitchens, American roaches (the big flying ones) coming up from sewer lines through floor drains. August is also when fire ant mounds explode in size across the South. A bag of TopChoice granular ($20-30 for a 25 lb bag) broadcast across your yard gives you a full year of control.

Fall (September through November)

Fall is transition season. Outdoor pests are dying off or slowing down, but everything that wants to survive winter is trying to get inside your house. This is when exclusion work matters most.

September: Yellow jacket nests hit maximum size. A mature nest can hold 5,000 workers. They're aggressive near food, especially sugary drinks and meat at cookouts. This is the month with the most yellow jacket stings reported to poison control centers. Stink bugs, Asian lady beetles, and boxelder bugs start clustering on south-facing exterior walls, looking for gaps to crawl through.

October: Mice move indoors. A mouse can squeeze through a hole the size of a dime. Once they're in your walls, they breed fast, chew wiring (fire hazard), and contaminate insulation with droppings. October is your last good window to seal entry points. Check the pest-proofing guide for a full entry-point checklist. Copper mesh plus caulk on every gap larger than a quarter-inch. Pay attention to where utility lines enter the house, dryer vents, and garage door seals.

November: If you haven't sealed up by now, you've probably got mice or rats already inside. Snap traps along walls, baited with peanut butter. Set them perpendicular to the wall with the trigger facing the baseboard. Outdoor pest activity drops sharply after the first hard freeze, but cluster flies and overwintering insects are now in your wall voids. You won't see them again until a warm winter day tricks them into emerging.

Winter (December through February)

Winter is indoor pest season. If something's bugging you between December and February, it was already inside before the cold hit.

December: Mice and rats are the main call drivers. German roaches stay active year-round in heated buildings. If you're in an apartment or townhouse with shared walls, your neighbor's roaches are your roaches. Spiders slow down but don't disappear. Brown recluses survive fine in heated homes and stay active in closets, storage boxes, and rarely-used rooms.

January: Honestly? If you don't have pest problems by January, you sealed your house well. Pat yourself on the back. This is a good time to check termite bait stations if you have them. Sentricon and Trelona stations should be inspected quarterly. Most termite warranties require it, and January is when a lot of people forget.

February: Last quiet month before spring ramps up again. Schedule your first quarterly treatment for mid-March. If you had rodent problems this winter, now's the time for a full exclusion job before they breed in spring. A professional exclusion typically runs $300-800 depending on house size and number of entry points.

Quarterly vs Monthly vs One-Time Service

Three models, three different situations. Here's when each one makes sense.

Quarterly service ($400-600 per year): A technician comes four times a year. They spray the perimeter, treat entry points, check bait stations, knock down wasp nests, and address whatever's active that season. This is the standard for most homes in pest-heavy regions. Between visits, you're covered for callbacks at no extra charge if something pops up. For a house in Georgia, Texas, Florida, or the Carolinas? Quarterly is the baseline.

Monthly service ($60-85 per visit, $720-1,020 per year): Makes sense in two situations. First, if you're dealing with an active infestation that needs repeated treatments. German roaches in a multi-unit building, for example. Second, if you run a food-service business. Restaurants, bakeries, and warehouses often need monthly service to maintain health department compliance.

One-time service ($150-350 per visit): You've got a specific problem and you want it handled. Wasp nest removal, a mouse that got in, ants in the kitchen. Good for people who don't need ongoing coverage but need professional help right now. The downside is no warranty between visits. If the ants come back in three weeks, you're paying again.

The Math: Prevention vs Reaction

Quarterly service costs $400-600 a year. That covers four visits plus callbacks. You're paying roughly $1.50 a day to keep your house treated year-round.

Now look at the alternative. A single termite treatment runs $800-2,500. Bed bug heat treatment is $1,200-3,000 for a whole house. Rodent exclusion plus trapping plus cleanup is $500-1,500. One bad infestation wipes out two to three years of quarterly service costs. And that's before you factor in the damage. Termites cause an average of $3,000 in structural repairs before they're even detected.

Quarterly service isn't insurance. It's routine maintenance. Same logic as changing your oil. You can skip it and probably be fine for a while. But when it catches up to you, the bill is a lot bigger. Use the cost calculator to estimate what treatment would run for your specific situation.

Who Actually Needs Ongoing Service (and Who Doesn't)

Not everybody needs to be on a plan. I'll be straight about that.

If you live in a newer home (built after 2005) in a dry climate like Colorado, Utah, or the high desert, and you've never had a pest issue, you probably don't need quarterly service. Those homes were built with modern weatherstripping, sealed foundations, and treated lumber. A one-time call when something specific comes up is fine.

But if your house was built before 1990 and you're anywhere in the Southeast, Gulf Coast, or Mid-Atlantic, quarterly service is worth every penny. Older homes have gaps everywhere. Weep holes in brick, deteriorating door sweeps, settling cracks in the foundation, attic vents with no screening. These houses were built in an era when nobody thought twice about a quarter-inch gap around a pipe penetration. Add humidity, warm winters, and clay soil (termite heaven), and you've got year-round pest pressure that never really stops.

Apartments and townhouses are a different story. Shared walls mean shared pests. Your unit can be spotless and you'll still get German roaches migrating from the unit next door. In multi-family housing, building-wide treatment is the only thing that actually works long term.

Rural properties have their own set of problems. More wildlife pressure, more rodent entry, more wood-destroying insects. If you're on acreage with outbuildings, a quarterly plan that covers the main house plus a barn or shop usually runs $500-750 a year.

Putting It Together: Your Annual Checklist

Here's the short version. Print it out, stick it on the fridge, set calendar reminders. Whatever works for you.

• March: Schedule first quarterly treatment. Lay perimeter ant bait. Inspect foundation for termite mud tubes.
• April: Watch for termite swarmers. Get a free inspection if you see winged insects indoors.
• May: Dump standing water weekly. Start mosquito prevention. Check window screens for tears.
• June: Second quarterly treatment. Knock down small wasp nests early. Check attic for signs of wildlife.
• July-August: Monitor for bed bugs after travel. Treat fire ant mounds. Keep food sealed and counters clean.
• September: Third quarterly treatment. Begin sealing exterior gaps with copper mesh and caulk.
• October: Full entry-point inspection. Seal everything before mice move in. Replace worn door sweeps.
• November: Set snap traps in garage, basement, and attic as a monitoring tool.
• December: Fourth quarterly treatment (interior focus). Check termite bait stations.
• January-February: Inspect for rodent activity. Schedule exclusion work if needed before spring.

That's the playbook. Nothing fancy, nothing complicated. Just knowing what's coming and staying a step ahead of it. Find a pest control company near you and get your first quarterly visit on the calendar before March is over. You'll spend less, stress less, and deal with fewer surprises throughout the year.