Mosquito season in Sitka City and Borough, AK: when it starts and ends
Mosquito months in Sitka City and Borough
In a normal year mosquito season in Sitka City and Borough, AK starts around June 1 and ends around September 24, about 16 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Sitka City and Borough, and when
- Start tipping out standing water weekly by May 18.
- Book any yard treatment for early June, ahead of the August peak.
- Repellent can go away after September 24.
- No West Nile cases since 2016, so bites in Sitka City and Borough are a nuisance; check window screens.
Sitka City and Borough against the rest of AK
Sitka City and Borough has the 7th longest season of 26 AK counties, at 115 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 44.1°F.
- Petersburg Borough: May 22 to September 20 (121 days, 0 WNV)
- Haines Borough: May 18 to September 15 (120 days, 0 WNV)
- Kenai Peninsula Borough: May 28 to September 12 (107 days, 0 WNV)
- Chugach Census Area: May 31 to September 14 (107 days, 0 WNV)
West Nile in Sitka City and Borough
CDC ArboNET lists no human West Nile cases for Sitka City and Borough from 1999 to 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.