Mosquito season in Northwest Arctic Borough, AK: when it starts and ends

Mosquito months in Northwest Arctic Borough

In a normal year mosquito season in Northwest Arctic Borough, AK starts around June 25 and ends around August 22, about 8 weeks.

What to do in Northwest Arctic Borough, and when

Start tipping out standing water weekly by June 11.
Book any yard treatment for late June, ahead of the July peak.
Repellent can go away after August 22.
No West Nile cases since 2016, so bites in Northwest Arctic Borough are a nuisance; check window screens.

Northwest Arctic Borough against the rest of AK

Northwest Arctic Borough has the 25th longest season of 26 AK counties, at 59 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 24°F.

Denali Borough: June 6 to August 18 (73 days, 0 WNV)
Aleutians East Borough: July 5 to September 4 (61 days, 0 WNV)
Nome Census Area: June 29 to August 16 (48 days, 0 WNV)

West Nile in Northwest Arctic Borough

CDC ArboNET lists no human West Nile cases for Northwest Arctic Borough from 1999 to 2025.

See how the dates are worked out, and when the season starts across the US.