Mosquito season in Garfield County, UT: when it starts and ends
Mosquito months in Garfield County
In a normal year mosquito season in Garfield County, UT starts around April 22 and ends around October 20, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Garfield County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 20.
- No West Nile cases since 2016, so bites in Garfield County are a nuisance; check window screens.
Garfield County against the rest of UT
Garfield County has the 6th longest season of 29 UT counties, at 181 days against 210 in Salt Lake County and 82 in Summit County. Its mean temperature is 51.3°F.
- Utah County: April 9 to October 25 (199 days, 28 WNV)
- Davis County: April 16 to October 20 (188 days, 36 WNV)
- Washington County: April 24 to October 22 (181 days, 9 WNV)
- Uintah County: April 19 to October 13 (177 days, 6 WNV)
West Nile in Garfield County
CDC ArboNET lists no human West Nile cases for Garfield County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
See how the dates are worked out, and when the season starts across the US.