North Dakota Mosquito Forecast
North Dakota'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 North Dakota?
North Dakota'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 North Dakota?
Within North Dakota, the most consistent pressure tends to land around Fargo, Bismarck, and Grand Forks. 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 North Dakota forecast works
MosquitoCast estimates North Dakota'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 North Dakota is directly comparable to anywhere else in the country.