The North Texas Pest Calendar, Month by Month

North Texas pest pressure follows a predictable annual pattern: overwintering pests in January and February, fire ants and wasp queens in spring, mosquitoes and chiggers through summer, armyworms and indoor migration in late summer, and rodent activity as it cools.

January and February

Quiet above ground. This is exclusion season: seal weep holes, replace door sweeps, and close plumbing penetrations while nothing is pressing against them. Rodents are the main active concern, seeking warmth.

March and April

Fire ant colonies resume full foraging, which makes this the highest-value bait application of the year. Wasp queens start new nests, so early nest removal costs almost nothing. Mosquito activity begins as nights hold above fifty, earlier in creek-adjacent yards.

May and June

The first mosquito peak, driven by spring rain. Chigger season begins. Fleas become active. This is the busiest stretch of the year and the point at which people who did not start in April are playing catch-up.

July and August

Chinch bug damage appears along driveways. Mosquito pressure spikes seven to ten days after each storm. Chiggers peak in humidity. Late August brings the start of the indoor migration as ground dries out.

September and October

Peak West Nile risk, which is the worst possible time to stop mosquito treatment. Armyworms arrive on weather fronts. Grub damage becomes visible. Spiders and scorpions move toward the structure.

November and December

Activity winds down. Rodents seek shelter. A good window to review what went wrong during the year and fix the physical entry points before the cycle starts again.

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