Idaho Mosquito Forecast

Idaho stretches far enough north-to-south that its mosquito season isn't uniform. Areas near Twin Falls warm earlier and stay active longer, while cooler conditions up around Post Falls squeeze activity into the peak summer months. Pressure is on the lighter side overall, but local conditions, shown on the map above, decide any given day.

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When is mosquito season in Idaho?

Idaho's mosquito season runs from late May into early September. 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. The season also shifts within the state, running earlier and longer toward Twin Falls and shorter and later up around Post Falls.

Where are mosquitoes worst in Idaho?

Within Idaho, the most consistent pressure tends to land around Boise, Meridian, and Nampa. 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 Idaho forecast works

MosquitoCast estimates Idaho'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 Idaho is directly comparable to anywhere else in the country.