Mosquito season in Denali Borough, AK: when it starts and ends
Mosquito months in Denali Borough
In a normal year mosquito season in Denali Borough, AK starts around June 6 and ends around August 18, about 10 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Denali Borough, and when
- Start tipping out standing water weekly by May 23.
- Book any yard treatment for early June, ahead of the July peak.
- Repellent can go away after August 18.
- No West Nile cases since 2016, so bites in Denali Borough are a nuisance; check window screens.
Denali Borough against the rest of AK
Denali Borough has the 23rd longest season of 26 AK counties, at 73 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 28.1°F.
- 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)
- Aleutians East Borough: July 5 to September 4 (61 days, 0 WNV)
- Northwest Arctic Borough: June 25 to August 22 (59 days, 0 WNV)
West Nile in Denali Borough
CDC ArboNET lists no human West Nile cases for Denali Borough from 1999 to 2025.
More: how the dates are worked out · when the season starts across the US.