Which pests are active this season, and what should you do now?
Spring pest activity in the United States runs March to May. Termites swarm February to April, the one moment a hidden colony reveals itself. Carpenter ant swarmers indoors in numbers point to a nest inside. Fire ant baits work at 70°F soil, not below 65°F. PestChief offers a free match with one independent local pest control company.
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When do termites swarm in spring?
Termites swarm between February and April in most of the United States, and that swarm is the one moment a hidden colony shows itself above ground. UGA Extension's biology of subterranean termites describes the spring flight as the colony's reproductive dispersal. Winged swarmers indoors, or piles of shed wings on sills, justify a professional inspection.
What do winged ants indoors mean in spring?
Large numbers of winged carpenter ants emerging inside the house point to a nest inside the structure, while a few stray swarmers do not, according to University of Minnesota Extension. The count matters more than the sighting. Late winter into spring is when indoor carpenter ant nests announce themselves this way.
When does fire ant bait start working?
Fire ant baits work once soil temperatures reach about 70°F and are ineffective below 65°F, when ants stop foraging and ignore them, per the Texas A&M Two-Step Method. Broadcasting bait too early in spring wastes the application. Wait for sustained warm soil, then bait, then treat individual mounds.
When does acting early pay off?
Timing is the cheapest lever a homeowner has. These are the windows where a small action now prevents a larger job later.
| Window | Pest | Action | Why |
|---|---|---|---|
| Late winter to spring | Carpenter ants | Inspect for an indoor nest | Large numbers of winged ants indoors is a sure sign of a nest inside the home. A few is not |
| Feb to Apr | Termites | Watch for swarms, inspect | The one moment a hidden colony reveals itself |
| Soil at 70°F | Fire ants | Broadcast bait | Baits are ineffective below 65°F and ants ignore them in winter |
What should you do now, and what can wait?
Do now: deal with what is already indoors. Anything you can see, hear or smell inside the house has an established population behind it, and it grows while you wait. Pests that damage the structure, such as termites and carpenter ants, move to the front of the queue whatever the season.
Plan for: the pressure the next season brings. Seal entry points, fix standing water and clear food sources before the pests that use them become active. Prevention done in the quiet months is almost always cheaper than treatment done in the peak ones.
Where can you read about each pest?
Which pests matter most shifts through the year, and it also depends on where you live. The timing table on this page sets out the windows where acting early usually costs less than waiting. For how each pest is identified, what the signs look like and what treatment involves, read the pest guides.
Where does this information come from?
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