Ant season typically peaks in spring and summer, with the most active months being April through September in most parts of the United States, though exact timing varies by species, climate, and region, and ants can remain active year-round in heated homes. Ant season begins in early spring, March through May, as temperatures rise above 50 degrees Fahrenheit and overwintering colonies become active, with queen ants starting to lay more eggs and worker ants increasing foraging for food to support colony growth, so March and April see odorous house ants and carpenter ants sending scouts into kitchens seeking sweets and moisture. Late spring to early summer, May and June, is peak ant season for most species because colonies are growing rapidly and need more food, so trails into homes become more common, and carpenter ants swarm in spring to establish new nests. Summer, June through August, is the most active period overall because heat accelerates metabolism and reproduction, with fire ants, pavement ants, and Argentine ants highly active outdoors and indoors, and ant mounds more visible. Fall, September through October, sees a second surge indoors as ants seek warmth and food before winter, though activity starts to decline outdoors as temperatures drop. In warm southern states, ant season lasts longer from February to November due to mild winters, while in northern states it is shorter from April to September. In heated homes, odorous house ants and pharaoh ants can be active year-round, so pest control professionals recommend preventative treatments in early spring March to May to create barriers before peak season, with quarterly service for continuous protection.
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