Mosquito season in Montmorency County, MI: when it starts and ends
Mosquito months in Montmorency County
In a normal year mosquito season in Montmorency County, MI starts around May 8 and ends around October 5, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Montmorency County, and when
- Start tipping out standing water weekly by April 24.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 5.
- No West Nile cases since 2016, so bites in Montmorency County are a nuisance; check window screens.
Montmorency County against the rest of MI
Montmorency County has the 61st longest season of 83 MI counties, at 150 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 43.4°F.
- Cheboygan County: May 9 to October 8 (152 days, 0 WNV)
- Alpena County: May 10 to October 8 (151 days, 0 WNV)
- Ontonagon County: May 10 to October 7 (150 days, 1 WNV)
- Emmet County: May 10 to October 7 (149 days, 2 WNV)
West Nile in Montmorency County
CDC ArboNET lists no human West Nile cases for Montmorency County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 7 of those years.
More: how the dates are worked out · when the season starts across the US.