Located just northwest of Atlanta, Marietta experiences a warm, humid subtropical climate prime territory for mosquito activity almost half the year. Warm temperatures, frequent rainfall, and high humidity create ideal breeding conditions, especially in shaded yards, wooded areas, and near standing water such as ponds, gutters, and creeks.
Understanding how Marietta’s weather patterns influence mosquito behavior helps residents better time prevention efforts and anticipate seasonal surges.
Spring (March–May)
Spring marks the beginning of mosquito season in Marietta. As daytime temperatures consistently rise above 50°F, overwintering mosquito eggs begin to hatch.
Frequent rainfall and storms create puddles, clogged gutters, and saturated soil—perfect breeding grounds.
Tree holes, planters, birdbaths, and drainage ditches become early hotspots for species like Aedes albopictus (Asian tiger mosquito).
Summer (June–August)
Summer brings peak mosquito activity. Heat and humidity dramatically accelerate mosquito growth cycles, allowing larvae to mature into adults in as little as 5–7 days.
Afternoon thunderstorms followed by warm evenings cause rapid population spikes.
Shaded, moist environments—like beneath decks, dense shrubs, or creek beds—remain active well into the night.
Culex species, known to carry West Nile virus, become more active during dusk and nighttime hours.
Early Fall (September–October)
Mosquito activity often stays high into October due to lingering warmth and humidity.
Late-season rain showers contribute to temporary population rebounds.
As overnight temperatures slowly cool, mosquito behavior shifts to feeding more aggressively before conditions drop below survival thresholds.
Winter (November–February)
Cold weather reduces visible mosquito activity, but the season doesn’t fully eliminate them.
Eggs from Aedes species survive winter in dry containers and hatch quickly when temperatures warm.
Mild winters—which are becoming more frequent—can allow limited mosquito activity on warmer days.
