Montana Mosquito Forecast
Montana's winters shut mosquito activity down for months — but snowmelt and standing water then drive a sharp surge from June through August. Pressure is low across the calendar as a whole, yet spikes hard at the peak.
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When is mosquito season in Montana?
Montana's mosquito season runs from June through August. Activity ramps up once overnight lows hold above about 50°F, and surges in the two to three days after rain, when fresh standing water triggers a new hatch. The window is short, but it can be relentless while it lasts.
Where are mosquitoes worst in Montana?
Within Montana, the most consistent pressure tends to land around Billings, Missoula, and Great Falls. Low, wet ground near these areas turns spring snowmelt and rain into prime breeding habitat. Anywhere near rivers, marshes, lakes, or recent flooding will read higher than the surrounding area — exactly the kind of local detail the live map above is built to show.
How the Montana forecast works
MosquitoCast estimates Montana's mosquito activity from live weather — temperature, humidity, wind, and recent rainfall — layered on the area's long-term rainfall climate, elevation, and terrain, and refreshed every day from NOAA's forecast data. It's the same model nationwide, so the reading for Montana is directly comparable to anywhere else in the country.