Picture this: you decide to take an early fall excursion to your favorite hiking trail to take advantage of some pleasant weather after a few days of colder temperatures. After all, the bugs should be gone, right? Mostly, but not always. On mild fall days or surprise warm spells, you can still end up with an occasional bite.

Most outdoor enthusiasts expect mosquitoes and other insects to vanish once cold temperatures creep in, but they end up surprised by a stray bite during late-season hikes or warm spells. As it turns out, winter doesn’t eliminate mosquitoes entirely. They’re far less active, but they don’t disappear. Their behavior shifts in ways that people don’t see, leading to their confusion about their activity and when it’s safe to drop mosquito protection.

Let’s break down what happens to these nagging nuisances when temperatures fall, how they survive, and why protection can still matter during late fall, early spring, and unexpected warm spells, even in northern climates.

Spending time outdoors in warm, humid weather often means dealing with biting midges. The tiny flying insects, sometimes called “no-see-ums,” depending on where you live, are a real nuisance. Their bites can leave behind itchy welts that linger for days. They're a major frustration for hikers and gardeners.

The good news? Once you understand what attracts midges, the conditions that make them possible, and the natural signals people give off, you can help reduce your exposure. You may not always be able to prevent dealing with them, but there are steps you can take to make outdoor activities far more comfortable (and far less itchy).