Mosquito season in Piute County, UT: when it starts and ends
Mosquito months in Piute County
In a normal year mosquito season in Piute County, UT starts around May 31 and ends around September 23, about 16 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Piute County, and when
- Start tipping out standing water weekly by May 17.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 23.
- No West Nile cases since 2016, so bites in Piute County are a nuisance; check window screens.
Piute County against the rest of UT
Piute County has the 26th longest season of 29 UT counties, at 115 days against 210 in Salt Lake County and 82 in Summit County. Its mean temperature is 46.6°F.
- Iron County: May 17 to September 29 (135 days, 0 WNV)
- Sevier County: May 26 to September 29 (126 days, 1 WNV)
- Rich County: May 30 to September 11 (104 days, 0 WNV)
- Wasatch County: June 8 to September 20 (104 days, 0 WNV)
West Nile in Piute County
CDC ArboNET lists no human West Nile cases for Piute County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.