Mosquito season in Carbon County, WY: when it starts and ends
Mosquito months in Carbon County
In a normal year mosquito season in Carbon County, WY starts around May 17 and ends around September 26, about 19 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carbon County, and when
- Start tipping out standing water weekly by May 3.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 26.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Carbon County against the rest of WY
Carbon County has the 17th longest season of 23 WY counties, at 132 days against 163 in Big Horn County and 75 in Teton County. Its mean temperature is 42.5°F.
- Crook County: May 14 to October 1 (140 days, 1 WNV)
- Hot Springs County: May 14 to September 29 (138 days, 1 WNV)
- Albany County: May 22 to September 14 (115 days, 1 WNV)
- Uinta County: May 30 to September 20 (113 days, 1 WNV)
West Nile in Carbon County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Carbon County (2 neuroinvasive) across 4 years. The worst was 2013 with 2; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.