Mosquito season in Bristol Bay Borough, AK: when it starts and ends

Mosquito months in Bristol Bay Borough

In a normal year mosquito season in Bristol Bay Borough, AK starts around June 3 and ends around September 9, about 14 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Bristol Bay Borough, and when

• Start tipping out standing water weekly by May 20.
• Book any yard treatment for early June, ahead of the July peak.
• Repellent can go away after September 9.
• No West Nile cases since 2016, so bites in Bristol Bay Borough are a nuisance; check window screens.

Bristol Bay Borough against the rest of AK

Bristol Bay Borough has the 12th longest season of 26 AK counties, at 97 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 36.4°F.

• Fairbanks North Star Borough: May 20 to August 29 (101 days, 0 WNV)
• Juneau City and Borough: June 1 to September 6 (98 days, 0 WNV)
• Hoonah-Angoon Census Area: June 3 to September 7 (95 days, 0 WNV)
• Yakutat City and Borough: June 8 to September 9 (93 days, 0 WNV)

West Nile in Bristol Bay Borough

CDC ArboNET lists no human West Nile cases for Bristol Bay Borough from 1999 to 2025.

Background: when mosquitoes go away for the winter; how the dates are worked out.