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Minnesota · Mosquito Season Guide

Is it mosquito season in Minnesota?

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II. Minnesota Mosquito Season Month by month

Minnesota's reputation as the "land of 10,000 lakes" is also a description of 10,000 mosquito breeding sites. Snowmelt floods floodplains in April and May, loading the landscape with standing water just as temperatures warm. The resulting June–August peak is among the most intense in North America — a short window with very high density.

Twin Cities / Southern MN
Minneapolis · Rochester · St. Cloud
Northern MN / Northwoods
Duluth · Bemidji · Boundary Waters
Very Low Low Moderate High Very High taller = more active · color = severity
~50
mosquito species recorded in Minnesota
>10,000
lakes providing potential breeding habitat
June–Aug
peak window; among the most intense in the US
87
counties with seasonal exposure

The Twin Cities metro: urban intensity

Minneapolis–Saint Paul experiences intense mosquito pressure despite its urban character, driven by the Mississippi and Minnesota River floodplains, Chain of Lakes, and extensive park systems with standing water. The metro runs the state's highest West Nile Virus case counts most years, with Hennepin and Ramsey counties consistently active June through September.

Northern Minnesota and the Boundary Waters

The Lake Superior north shore and Boundary Waters region are legendary for mosquito intensity — a combination of boreal wetlands, beaver ponds, and cool moist air that sustains populations through most of June and July. Hikers and paddlers in the BWCA should treat mosquito protection as essential gear, not optional.

Southern Minnesota: the agricultural corridor

The southern tier, including Rochester and the agricultural counties, follows a similar June–August peak but with somewhat less intensity than the north. The Minnesota and Des Moines River corridors drive floodwater surges after heavy rains, and West Nile Virus is detected annually across the region.

III. Minnesota's Three Species to Know
Aedes vexans floodwater mosquito photograph
Aedes vexans
Floodwater Mosquito

The dominant nuisance species in Minnesota. Eggs overwinter in floodplain soil and hatch explosively after spring snowmelt — populations can increase by orders of magnitude within days. Responsible for the intense early-season surges that define the Minnesota experience.

Culex tarsalis mosquito photograph
Culex tarsalis
Western Encephalitis Mosquito

The primary West Nile Virus vector in western and central Minnesota. Breeds in warm, nutrient-rich standing water — irrigation pooling, roadside ditches, farm ponds. Peaks in July–August, and its WNV transmission rate increases during hot, dry conditions that concentrate bird hosts near water.

Culex pipiens northern house mosquito photograph
Culex pipiens
Northern House Mosquito

The dominant urban mosquito in the Twin Cities metro. Breeds in stagnant water in gutters, storm drains, and urban catch basins. The main WNV vector in the Minneapolis–Saint Paul area, with activity concentrated July through September in residential neighborhoods.

IV. Minnesota Cities at a Glance
CityPeak SeasonOff-SeasonNotes
Minneapolis Jun – Sep Off Oct–May Mississippi River floodplain; Chain of Lakes; highest WNV case counts in state most years Check live
Saint Paul Jun – Sep Off Oct–May Battle Creek, Phalen, and Como wetlands; floodplain corridors near downtown sustain populations Check live
Duluth Jun – Aug Off Sep–May Shorter Lake Superior north shore season; intense during peak weeks in boreal wetland areas Check live
Rochester Jun – Sep Off Oct–May Zumbro River corridor; agricultural floodwater species prominent after spring rains Check live
St. Cloud Jun – Sep Off Oct–May Mississippi River and Sauk River junction; one of the earliest metro-area locations to see surges Check live
More State Guides
Florida Year-round activity in the south — 80+ species including invasive Ae. aegypti and the Asian tiger mosquito across all 67 counties Texas ~85 species across four climate zones — Gulf Coast active March through November, with year-round pressure in the Rio Grande Valley California Central Valley is the #1 West Nile corridor in the US — invasive Ae. aegypti and Ae. albopictus now established in 20+ counties Georgia Atlanta metro leads the Southeast in Asian tiger mosquito density — active statewide March through November New York Ground zero for West Nile in the US (1999 Queens outbreak) — NYC metro and Long Island see the highest Northeast seasonal pressure Illinois Home of the 2002 Cook County West Nile outbreak — the deadliest urban WNV event in US history — peak season June through September Ohio Lake Erie to the Ohio River — WNV active in Franklin and Cuyahoga counties, with floodwater species surging after summer storms Pennsylvania Philadelphia WNV corridor meets rural EEE risk in western PA — the densest human population in the mid-Atlantic mosquito belt Michigan Site of the 2019 EEE outbreak — the deadliest in decades — 10 human cases and 6 deaths concentrated in SW Michigan Great Lakes wetlands New Jersey Oldest organized county mosquito control in the US (1914) — Pine Barrens EEE corridor and fierce salt marsh Shore species Virginia Tidewater season runs April–October — the longest mid-Atlantic window — with the Great Dismal Swamp as an active EEE hotspot North Carolina The coastal plain runs one of the longest seasons in the Southeast — NC leads the nation in La Crosse encephalitis cases from the Appalachian foothills Maryland Chesapeake Bay watershed creates extraordinary mosquito habitat — tidal marshes, Eastern Shore wetlands, and the DC-Baltimore corridor combine for dense seasonal pressure Tennessee Memphis and the Mississippi River corridor historically record the highest WNV case counts in the mid-South — Ae. albopictus has colonized all 95 counties Indiana Indiana sits at the crossroads of the Great Lakes EEE belt — Lake Michigan wetlands in the north and the Wabash River floodplain drive intense seasonal pressure Louisiana The Gulf Coast's most intense pressure — coastal marshes and summer rains keep Cx. quinquefasciatus and Ae. aegypti active from March through November Alabama Mobile Bay to the Tennessee Valley — Ae. albopictus has reached all 67 counties and peak WNV season runs June through September South Carolina Low Country marshes produce some of the Southeast's densest Anopheles and Culex populations — season runs March through November Wisconsin Great Lakes wetlands and the Mississippi River backwaters drive strong WNV pressure in the Milwaukee corridor — peak season July through August Missouri At the confluence of the Missouri and Mississippi rivers — St. Louis historically ranks among the highest WNV cities in the US — season May through October Arkansas Delta rice-field flooding and the Arkansas River bottomlands create some of the highest rural mosquito pressure in the mid-South — active April through October Washington Western WA stays mild and damp year-round; the Yakima Valley and Columbia Basin face the highest WNV risk in the Pacific Northwest — peak July through September Arizona Monsoon season (July–September) drives sudden mosquito explosions across the Valley of the Sun — WNV detected annually Colorado Front Range WNV corridor stretches Denver to Fort Collins — eastern plains carry the state's highest risk Connecticut Connecticut River valley WNV pressure meets EEE risk in inland freshwater wetlands — active May through October Delaware Chesapeake and Delaware Bay marshes create outsized pressure for the nation's second-smallest state Hawaii Year-round activity at sea level — no native species, but Ae. aegypti and tiger mosquitoes established statewide Idaho Snake River Plain irrigation districts fuel summer WNV pressure — season June through September Iowa Mississippi River corridor and prairie wetlands drive intense June–September pressure — WNV active statewide Kansas Great Plains WNV corridor — Wichita and Kansas City see peak pressure July–August; floodwater species surge after storms Kentucky Ohio River corridor and Kentucky Lake wetlands sustain a long April–October season across all 120 counties Maine Short but intense July–August season — EEE detected in some years in the southern coastal plain Massachusetts EEE fatality rate exceeds 30% — the Plymouth County swamp complex is the active epicenter — season May through October Mississippi Gulf Coast near-year-round pressure meets Delta rice-field flooding for one of the South's most intense mosquito environments Montana Yellowstone and Missouri River corridors drive a compressed June–August season — WNV detected most years in eastern MT Nebraska Platte River valley and eastern Nebraska are among the Great Plains' most active WNV zones — peak July–August Nevada Las Vegas monsoon season drives July–September activity; Reno irrigation districts fuel a parallel northern peak New Hampshire EEE detected most years — the southern lakes and coastal plain are in the active Northeast EEE corridor New Mexico Monsoon season (July–September) creates sudden breeding habitat; WNV circulates in the Rio Grande valley annually North Dakota Red River Valley flooding produces some of the Great Plains' most extreme floodwater mosquito events — peak June–August Oklahoma One of the South-Central's most intense seasons — the Arkansas and Red River corridors sustain populations April through October Oregon Eastern Oregon Columbia Basin is the state's WNV hotspot; western Oregon runs a mild coastal season June through September Rhode Island New England's densest coastal pressure — Narragansett Bay salt marshes and WNV active in all five counties South Dakota Missouri River and James River valleys drive summer WNV activity — eastern SD sees the most intense pressure Utah Salt Lake Valley WNV corridor and irrigation districts sustain a July–September peak — drier areas see limited activity Vermont Champlain Valley runs Vermont's longest season — EEE detected in the Lake Champlain lowlands in some years West Virginia Kanawha and Ohio River valleys sustain a May–October season — Ae. albopictus now established statewide Wyoming The shortest meaningful season of any contiguous US state — North Platte valley WNV window is just 6–8 weeks
West Nile, dengue, and EEE: US disease risk by region → Asian tiger mosquitoes: why you're getting bitten during the day → Eliminating standing water: the highest-leverage yard move →