IsItMosquitoSeasonYet
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Alabama · Mosquito Season Guide

Is it mosquito season in Alabama?

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II. Alabama Mosquito Season Month by month

Alabama spans the deep subtropical coast at Mobile Bay north through the Tennessee Valley, giving it one of the more varied mosquito profiles in the Southeast. The Gulf Coast sustains near-year-round conditions in warm years; the northern tier follows a standard mid-South pattern. Statewide, the season is among the longest east of the Mississippi.

Gulf Coast / Mobile Bay
Mobile · Baldwin County · Pensacola area
Central & Northern Alabama
Birmingham · Montgomery · Huntsville
Very Low Low Moderate High Very High taller = more active · color = severity
~60
mosquito species recorded in Alabama
~270
days of possible activity near Mobile Bay
3
disease-vectoring species of concern
67
counties — all with significant seasonal exposure

Gulf Coast and Mobile Bay: the earliest and longest season

Mobile and Baldwin counties open the state's season. Gulf warmth and coastal marshes allow activity as early as February in mild years, and populations stay meaningful into November or later. Mobile Bay's extensive tidal wetlands and urban drainage create some of the most persistent breeding habitat in the state.

Central Alabama: the heart of the season

The Black Belt counties and the Birmingham metro follow a March–November pattern that defines the Alabama average. The Coosa and Cahaba river systems create extensive floodwater habitat across central Alabama — Ae. vexans populations explode after heavy spring and summer rains, producing short-lived but very intense surges.

Northern Alabama and the Tennessee Valley

Huntsville and the Tennessee Valley run a slightly shorter season, building in April and tapering by October. The Wheeler and Guntersville reservoirs create significant shoreline habitat, and the region reports consistent West Nile Virus activity each season through the Culex pipiens complex.

III. Alabama's Three Species to Know
Culex quinquefasciatus macro photograph
Culex quinquefasciatus
Southern House Mosquito

The dominant West Nile Virus vector across central and southern Alabama. Breeds in stagnant urban water — gutters, catch basins, ornamental ponds. A dusk-to-dawn biter active from late spring through late fall statewide.

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

Now established in all 67 Alabama counties. An aggressive daytime biter that thrives in suburban landscapes — flower pots, tarps, clogged gutters. The dominant nuisance species in Birmingham, Montgomery, and Mobile suburban areas.

Aedes vexans floodwater mosquito photograph
Aedes vexans
Floodwater Mosquito

The primary post-rain surge species across Alabama. Eggs lie dormant in floodplain soil and hatch explosively after rainfall events — populations can increase from negligible to overwhelming within 7–10 days of a significant rain. Most intense in river corridor counties.

IV. Alabama Cities at a Glance
CityPeak SeasonOff-SeasonNotes
Mobile Feb – Nov Low Dec–Jan Gulf proximity and tidal wetlands make this Alabama's earliest and longest season Check live
Birmingham Mar – Oct Off Nov–Feb Red Mountain and Jones Valley urban drainage; tiger mosquito dense in residential neighborhoods Check live
Montgomery Mar – Oct Off Nov–Feb Alabama River floodplain drives floodwater species; urban stormwater sustains Culex populations Check live
Huntsville Apr – Oct Off Nov–Mar Tennessee Valley reservoirs create shoreline habitat; consistent WNV activity each season Check live
Tuscaloosa Mar – Oct Off Nov–Feb Black Warrior River corridor; University area urban populations significant June–August 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 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 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 →