Mosquito season in Petersburg Borough, AK: when it starts and ends
Mosquito months in Petersburg Borough
In a normal year mosquito season in Petersburg Borough, AK starts around May 22 and ends around September 20, about 17 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Petersburg Borough, and when
- Start tipping out standing water weekly by May 8.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 20.
- No West Nile cases since 2016, so bites in Petersburg Borough are a nuisance; check window screens.
Petersburg Borough against the rest of AK
Petersburg Borough has the 5th longest season of 26 AK counties, at 121 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 43.7°F.
- Skagway Municipality: May 14 to September 18 (128 days, 0 WNV)
- Prince of Wales-Hyder Census Area: May 24 to September 26 (125 days, 0 WNV)
- Haines Borough: May 18 to September 15 (120 days, 0 WNV)
- Sitka City and Borough: June 1 to September 24 (115 days, 0 WNV)
West Nile in Petersburg Borough
CDC ArboNET lists no human West Nile cases for Petersburg Borough from 1999 to 2025.
See how the dates are worked out, and when the season starts across the US.