Mosquito season in Morgan County, UT: when it starts and ends
Mosquito months in Morgan County
In a normal year mosquito season in Morgan County, UT starts around May 10 and ends around October 1, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morgan County, and when
- Start tipping out standing water weekly by April 26.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 1.
- No West Nile cases since 2016, so bites in Morgan County are a nuisance; check window screens.
Morgan County against the rest of UT
Morgan County has the 20th longest season of 29 UT counties, at 144 days against 210 in Salt Lake County and 82 in Summit County. Its mean temperature is 46.8°F.
- Millard County: May 7 to October 5 (151 days, 1 WNV)
- Daggett County: May 10 to October 3 (146 days, 0 WNV)
- Kane County: May 15 to October 5 (143 days, 0 WNV)
- Sanpete County: May 12 to September 29 (140 days, 0 WNV)
West Nile in Morgan County
CDC ArboNET lists no human West Nile cases for Morgan County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
Background: when the season starts across the US; how the dates are worked out.