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Georgia · Mosquito Season Guide

Is it mosquito season in Georgia?

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II. Georgia Mosquito Season Month by month

Georgia spans three distinct climate zones — from the Blue Ridge Mountains in the north to the coastal marshes around Savannah. Season length and intensity shift dramatically across this range.

Very Low Low Moderate High Very High taller = more active · color = severity

Chart reflects Piedmont / Atlanta baseline. Coastal Georgia (Savannah) extends 2–3 weeks longer on each end. North Georgia mountains run 4–6 weeks shorter with a lower peak.

60+
mosquito species statewide
9 mo.
typical active season in the Piedmont
#1
Atlanta metro: top Asian tiger mosquito city in the Southeast
~10 mo.
season in coastal south Georgia near Savannah

Coastal Georgia: the longest season in the state

Savannah, Brunswick, and the Golden Isles sit at the same latitude as Los Angeles — and the humid coastal climate keeps temperatures warm enough for activity from mid-March through November, sometimes into December. The Okefenokee Swamp and the network of coastal marshes between Savannah and the Florida border provide enormous permanent breeding habitat for Culex populations. Aedes aegypti, the yellow fever mosquito, has been confirmed in the Savannah area and continues expanding northward.

Piedmont and Atlanta: daytime biting all season

The Atlanta metro area is one of the heaviest Asian tiger mosquito (Aedes albopictus) zones in the Southeast. Unlike typical mosquitoes that concentrate at dusk and dawn, the Asian tiger bites aggressively during the day — especially morning and late afternoon — making suburban yard time uncomfortable from April through October. Tree-canopy neighborhoods like Decatur, Morningside, and Grant Park see particularly intense pressure. The Culex quinquefasciatus Southern house mosquito adds evening and overnight pressure statewide.

North Georgia Mountains: short but real

Above roughly 2,000 feet — Dahlonega, Blue Ridge, Helen, and the Chattahoochee National Forest — the season compresses to May through September. Cooler nights and lower humidity reduce pressure significantly compared to Atlanta, and the elevation acts as a natural buffer. Still, visitors to mountain trail areas and lakefronts should use repellent during peak summer months.

III. Georgia's Three Species to Know
Aedes albopictus (Asian tiger mosquito) — CC BY-SA 2.0 James Gathany / CDC
Aedes albopictus
Asian Tiger Mosquito

The dominant suburban species in Atlanta and across north-central Georgia. Bites aggressively during daylight hours — particularly morning and late afternoon — making standard dusk-only protection insufficient. Arrived in Georgia in the 1980s and has expanded relentlessly. Breeds in tiny containers: bottle caps, clogged gutters, pot saucers, and tarps.

Culex quinquefasciatus (Southern house mosquito) — Wikimedia Commons CC BY-SA 3.0
Culex quinquefasciatus
Southern House Mosquito

Georgia's primary West Nile Virus vector. A dusk-to-dawn biter that thrives in stagnant standing water — drainage ditches, neglected pools, birdbaths, and floodwater. Present statewide but most abundant in the Piedmont and coastal plain. Responsible for the majority of late-evening biting pressure on patios and porches across the state.

Aedes aegypti (yellow fever mosquito) — CDC / James Gathany, public domain
Aedes aegypti
Yellow Fever Mosquito

Primarily a coastal Georgia species — confirmed in Savannah, the Golden Isles, and parts of the southwestern coastal plain. A capable vector of dengue and Zika. Visually similar to the Asian tiger but prefers indoor and semi-indoor environments. Range is expanding northward with warming winters, and is worth tracking in the Atlanta metro.

Georgia has two species that bite during daylight. The Asian tiger mosquito is established statewide; Ae. aegypti is expanding from the coast. Anyone spending time outdoors in Atlanta or along the coast should apply repellent in the morning, not just at dusk.

IV. Georgia Cities at a Glance
City Peak Season Off-Season Notes
Atlanta Apr – Oct Near-zero Dec–Feb Asian tiger mosquito capital of the Southeast; tree-canopy suburbs see intense daytime biting; Culex adds nighttime pressure through summer Check live
Savannah Mar – Nov Low (never fully zero) Longest season in GA; coastal marshes sustain large Culex populations; Ae. aegypti confirmed; tourism season overlaps peak months Check live
Augusta Apr – Oct Off Nov–Mar The Masters Tournament (April) coincides with early-season activity; Savannah River corridor sustains large Culex populations through summer Check live
Macon Apr – Oct Off Nov–Mar Central Georgia; both Culex and Asian tiger present; humidity builds significantly mid-summer; Ocmulgee River bottomlands amplify pressure Check live
Columbus Apr – Oct Off Nov–Mar Chattahoochee River floodplain sustains large Culex populations; Fort Moore area; agricultural drainage in surrounding Muscogee County Check live
Athens Apr – Oct Off Nov–Mar UGA campus; Oconee River greenways; Asian tiger mosquito well established in suburban corridors; manageable with container removal Check live
Albany Mar – Nov Low Dec–Feb Southwest Georgia; near-coastal climate extends season; Flint River basin; higher baseline pressure than north Georgia metros 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 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 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 →