Mosquito season in Ketchikan Gateway Borough, AK: when it starts and ends
Mosquito months in Ketchikan Gateway Borough
In a normal year mosquito season in Ketchikan Gateway Borough, AK starts around May 12 and ends around October 1, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ketchikan Gateway Borough, and when
- Start tipping out standing water weekly by April 28.
- Book any yard treatment for mid May, ahead of the August peak.
- Repellent can go away after October 1.
- No West Nile cases since 2016, so bites in Ketchikan Gateway Borough are a nuisance; check window screens.
Ketchikan Gateway Borough against the rest of AK
Ketchikan Gateway Borough has the 1st longest season of 26 AK counties, at 142 days against 142 in Ketchikan Gateway Borough and 48 in Nome Census Area. Its mean temperature is 46.3°F.
- Wrangell City and Borough: May 15 to September 25 (133 days, 0 WNV)
- Skagway Municipality: May 14 to September 18 (128 days, 0 WNV)
West Nile in Ketchikan Gateway Borough
CDC ArboNET lists no human West Nile cases for Ketchikan Gateway Borough from 1999 to 2025.
See how the dates are worked out, and when the season starts across the US.