Mosquito season in Sublette County, WY: when it starts and ends
Mosquito months in Sublette County
In a normal year mosquito season in Sublette County, WY starts around June 6 and ends around September 4, about 13 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Sublette County, 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 September 4.
- No West Nile cases since 2016, so bites in Sublette County are a nuisance; check window screens.
Sublette County against the rest of WY
Sublette County has the 22nd longest season of 23 WY counties, at 90 days against 163 in Big Horn County and 75 in Teton County. Its mean temperature is 35.6°F.
- Park County: June 4 to September 17 (105 days, 3 WNV)
- Lincoln County: June 8 to September 11 (95 days, 0 WNV)
- Teton County: June 20 to September 3 (75 days, 0 WNV)
West Nile in Sublette County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Sublette County (0 neuroinvasive) across 2 years. The worst was 2007 with 1; the latest was 2007.
More: how the dates are worked out · when mosquitoes go away for the winter.