Mosquitoes start showing up in spring once nights stay warm, build through June, and peak in July and August. The worst stretches follow a heavy rain and a week of heat — that is about how long it takes eggs laid in fresh water to become biting adults. Activity tapers in September and ends with the first hard freeze, usually in October.
Not every mosquito in a Kansas City yard behaves the same way, and that changes what works:
- Container breeders like the Asian tiger mosquito — small, black with white stripes, and biting during the day. They lay eggs just above the waterline in buckets, saucers, clogged gutters, tires and tree holes, and they usually stay close to where they hatched. If you are getting bitten in the afternoon in your own backyard, they are probably coming from your yard or the one next door.
- House mosquitoes (Culex), which bite mostly at dusk and after dark and breed in stagnant, nutrient-rich water — storm drains, neglected birdbaths, rain barrels, ditches. These are the species most associated with West Nile virus, which turns up in Kansas and Missouri most summers.
- Floodwater mosquitoes, whose eggs sit dry in low ground for months and hatch in large numbers after heavy rain. They can fly a long way, which is why a yard near a creek, a detention pond or open ground sees waves of them after a storm.
Only females bite; they need a blood meal to produce eggs. Between meals, adults rest in cool, shaded, humid spots — under decks, in dense shrubs and ground cover, along shady fence lines. That resting behavior is what yard misting targets. The egg-laying behavior — females searching for shaded, still water — is what the Fog-Free Mosquito Station Program targets. One method works on where mosquitoes rest; the other works on where they breed.