New Hampshire’s Mosquito Season Returns Early as Temperatures Climb

It feels like summer arrived a little sooner this year. In towns from Concord to the White Mountains, people are already hearing that familiar, high‑pitched whine that signals mosquitoes are back in business.

That buzzing isn’t just a nuisance. State health officials say the early surge is directly tied to the recent spike in daytime highs—many locations have been flirting with the mid‑80s for the past two weeks, a temperature range that lets mosquito larvae develop at lightning speed.

“We usually start seeing a noticeable increase in adult mosquito activity in late May,” explained Dr. Laura McAllister, a vector‑borne disease specialist with the New Hampshire Department of Health and Human Services. “This year, the numbers are climbing a week or two earlier, and that means we have to adjust our public‑health response accordingly.”

Local municipalities are already reacting. Several towns have stepped up larvicide applications in known breeding hotspots—standing water in storm drains, abandoned pools, and the odd backyard pond. The goal, officials say, is to keep the larvae from maturing into biting adults before they can spread illnesses like West Nile virus.

While the risk of disease transmission remains relatively low, it’s not zero. “We’ve had a few sporadic cases of West Nile in the past decade,” McAllister noted, “so we’re encouraging residents to protect themselves, especially those who spend a lot of time outdoors in the evenings.”

So what can everyday New Hampshirites do? First, eliminate standing water wherever possible—empty plant saucers, clear clogged gutters, and cover rain barrels. Second, consider using EPA‑registered insect repellents containing DEET, picaridin, or oil of lemon eucalyptus when heading out at dusk.

For those who love the outdoors but aren’t fans of the bite, donning long sleeves and pants can make a big difference, even on warm evenings. And if you do get a bite, resist the urge to scratch; applying a cold compress or a dab of hydrocortisone can calm the itch without causing an infection.

The early mosquito comeback serves as a reminder that climate patterns are shifting, and so are the tiny critters that thrive on warmth. As New Hampshire adjusts to warmer springs, staying informed and taking simple preventive steps can keep the buzz from becoming a bigger problem.