Mosquito season in Hot Springs County, WY: when it starts and ends
Mosquito months in Hot Springs County
In a normal year mosquito season in Hot Springs County, WY starts around May 14 and ends around September 29, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hot Springs County, and when
- Start tipping out standing water weekly by April 30.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 29.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk July to August, more so if over 60.
Hot Springs County against the rest of WY
Hot Springs County has the 16th longest season of 23 WY counties, at 138 days against 163 in Big Horn County and 75 in Teton County. Its mean temperature is 46.3°F.
- Johnson County: May 11 to September 30 (142 days, 0 WNV)
- Crook County: May 14 to October 1 (140 days, 1 WNV)
- Carbon County: May 17 to September 26 (132 days, 1 WNV)
- Albany County: May 22 to September 14 (115 days, 1 WNV)
West Nile in Hot Springs County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Hot Springs County (4 neuroinvasive) across 3 years. The worst was 2003 with 4; the latest was 2017.
See how the dates are worked out, and when mosquitoes go away for the winter.