Mosquito season in Beaver County, UT: when it starts and ends
Mosquito months in Beaver County
In a normal year mosquito season in Beaver County, UT starts around April 30 and ends around October 14, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Beaver County, and when
- Start tipping out standing water weekly by April 16.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- No West Nile cases since 2016, so bites in Beaver County are a nuisance; check window screens.
Beaver County against the rest of UT
Beaver County has the 13th longest season of 29 UT counties, at 167 days against 210 in Salt Lake County and 82 in Summit County. Its mean temperature is 51.8°F.
- Cache County: April 27 to October 12 (168 days, 22 WNV)
- Tooele County: April 28 to October 12 (167 days, 0 WNV)
- Box Elder County: April 30 to October 9 (162 days, 11 WNV)
- Juab County: May 2 to October 9 (160 days, 0 WNV)
West Nile in Beaver County
CDC ArboNET lists no human West Nile cases for Beaver County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.