Our winters rarely get cold enough to wipe out overwintering queens, so the cycle starts early. Paper wasps begin building in March as queens come out of overwintering, and colonies hit their largest and most defensive stretch from June through September.
Yellowjackets peak in late summer and early fall. In a warm fall, colonies around Houston stay active into November or even December — well past the “first frost ends wasp season” rule of thumb that works in cooler climates. Mud dauber activity tracks the spider population, so a heavy spider summer means more mud nests on the brick.
That timing is why a residual treatment on eaves, soffits, and window frames in early spring pays off: treating while queens are still scouting for nest sites stops colonies before they’re big enough to be a problem, which is easier than dealing with them in August.