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Arkansas · Mosquito Season Guide

Is it mosquito season in Arkansas?

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Check an Arkansas city
II. Arkansas Mosquito Season Month by month

Arkansas is one of the most underrated mosquito states in the country. The Mississippi Delta bottomlands in the east, the Arkansas River floodplain through the center, and the Red River in the southwest combine to create an extraordinary extent of seasonal floodwater breeding habitat. From March through November, activity is near-continuous across most of the state.

Delta / Mississippi Lowlands
Jonesboro · Pine Bluff · West Memphis
Highlands / Ozarks & Ouachita
Fayetteville · Fort Smith · Little Rock
Very Low Low Moderate High Very High taller = more active · color = severity
~60
mosquito species recorded in Arkansas
~260
active days in the Delta counties
3
disease-vectoring species of concern
75
counties — all with significant seasonal exposure

The Mississippi Delta: Arkansas's most intense zone

The Delta counties — Mississippi, Crittenden, Poinsett, Cross, and their neighbors — sit in the floodplain of the Mississippi River and its tributaries. Annual flooding loads the landscape with standing water just as temperatures warm in spring, producing floodwater mosquito populations that rank among the densest in the continental US. Jonesboro and West Memphis area residents experience some of the longest and most intense seasons in the state.

The Arkansas River Valley

Little Rock and the Arkansas River corridor from Fort Smith to the Delta represent the state's central mosquito belt. The river floodplain, combined with the central Arkansas bottomland hardwood forests, sustains significant breeding populations from March through October. Urban drainage and storm systems extend Culex populations into residential neighborhoods throughout the season.

Northwest Arkansas: the Ozark edge

Fayetteville, Bentonville, and the rapidly growing northwest Arkansas metro sit at the edge of the Ozark Plateau, where the season is shorter and less intense than the lowlands. The region still sees meaningful June–August pressure, and Asian tiger mosquito populations have expanded rapidly with urbanization.

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

The dominant species in the Delta and river bottom counties. Hatches in massive numbers from floodplain soils after spring flooding and heavy rains — populations in the Delta can reach extraordinary densities following Mississippi River high-water events. Disperses miles from breeding sites.

Culex quinquefasciatus macro photograph
Culex quinquefasciatus
Southern House Mosquito

The primary West Nile Virus vector across Arkansas. Present statewide from late spring through fall, breeding in stagnant urban water. WNV is detected annually — Pulaski, Crittenden, and Garland counties log the highest case counts in most years.

Aedes albopictus — Asian tiger mosquito macro photograph
Aedes albopictus
Asian Tiger Mosquito

Established statewide and a growing presence in northwest Arkansas with rapid urbanization. An aggressive daytime biter active through the entire warm season. Little Rock and Fayetteville suburban areas see dense populations in neighborhoods with container water sources.

IV. Arkansas Cities at a Glance
CityPeak SeasonOff-SeasonNotes
Little Rock Mar – Nov Off Dec–Feb Arkansas River floodplain; Fourche Creek watershed; dense Culex populations in urban areas Check live
Jonesboro Mar – Nov Off Dec–Feb Delta edge; St. Francis River basin; among the most active large-city locations in the state Check live
Pine Bluff Mar – Nov Off Dec–Feb Arkansas River/Bayou Meto confluence; bottomland hardwood floodplain; intense spring surges Check live
Fort Smith Mar – Oct Off Nov–Feb Arkansas River corridor; Oklahoma border; river bottom floodwater species prominent in spring Check live
Fayetteville Apr – Oct Off Nov–Mar Ozark Plateau edge; shorter season; but NW Arkansas urbanization expanding tiger mosquito range 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 Minnesota 10,000 lakes means 10,000 breeding sites — the Northwoods sees intense but short July–August peaks, while the Twin Cities face a longer June–September window 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 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 →