Tick & mosquito activity today
Are ticks and mosquitoes active in outdoor areas today?
Bug pressure isn't constant — it tracks the weather. Mosquitoes get active above roughly 60°F and thrive in humid, still evenings; ticks quest most aggressively in warm, moist conditions and go quiet in drought, heat, and cold. The same trail can be miserable one week and fine the next.
This tool reads your city's current temperature, humidity, and season to estimate today's activity for both, so you can decide how much protection an evening outside actually needs.
When activity is high, the CDC's playbook is short and effective: EPA-registered repellent, long sleeves at dusk for mosquitoes, and a tick check within a couple of hours of coming inside from grass or brush.
Check a major city
How it works
This is a weather conditions index for tick and mosquito activity in outdoor environments — parks, wooded trails, tall grass, and areas near standing water. It does not reflect risk for people in paved, urban, or indoor settings. Ticks become active above 45°F in moist, shaded areas; humidity above 60% and recent rainfall keep them active near ground level. Mosquitoes thrive above 60°F and breed in standing water — recent rainfall, high humidity, and low wind all increase their numbers. Think of this like a UV index: it tells you the intensity of conditions outside, not your personal exposure. If you're heading to a park, hiking trail, or campsite, use this to decide on repellent and protective clothing.