Mosquito season in Anchorage Municipality, AK: when it starts and ends
Mosquito months in Anchorage Municipality
In a normal year mosquito season in Anchorage Municipality, AK starts around June 7 and ends around August 28, about 12 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Anchorage Municipality, and when
- Start tipping out standing water weekly by May 24.
- Book any yard treatment for early June, ahead of the July peak.
- Repellent can go away after August 28.
- 1 West Nile case since 2016 (last 2021): you should use repellent at dusk July, more so if over 60.
Anchorage Municipality against the rest of AK
Anchorage Municipality has the 20th longest season of 26 AK counties, at 82 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 35.5°F.
- Southeast Fairbanks Census Area: May 29 to August 22 (85 days, 0 WNV)
- Kodiak Island Borough: June 16 to September 9 (84 days, 0 WNV)
- Copper River Census Area: June 4 to August 23 (80 days, 0 WNV)
- Lake and Peninsula Borough: June 15 to August 31 (77 days, 0 WNV)
West Nile in Anchorage Municipality
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Anchorage Municipality (1 neuroinvasive) across 1 year. The worst was 2021 with 1; the latest was 2021.
More: how the dates are worked out · when mosquitoes go away for the winter.