Mosquito season in Wayne County, UT: when it starts and ends
Mosquito months in Wayne County
In a normal year mosquito season in Wayne County, UT starts around April 5 and ends around October 24, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wayne County, and when
- Start tipping out standing water weekly by March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 24.
- No West Nile cases since 2016, so bites in Wayne County are a nuisance; check window screens.
Wayne County against the rest of UT
Wayne County has the 2nd longest season of 29 UT counties, at 202 days against 210 in Salt Lake County and 82 in Summit County. Its mean temperature is 53.6°F.
- Salt Lake County: April 2 to October 29 (210 days, 70 WNV)
- Grand County: April 8 to October 26 (201 days, 4 WNV)
- Utah County: April 9 to October 25 (199 days, 28 WNV)
West Nile in Wayne County
CDC ArboNET lists no human West Nile cases for Wayne 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.