Mosquito season in Lake County, MI: when it starts and ends
Mosquito months in Lake County
In a normal year mosquito season in Lake County, MI starts around May 18 and ends around October 7, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lake County, and when
- Start tipping out standing water weekly by May 4.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 7.
- No West Nile cases since 2016, so bites in Lake County are a nuisance; check window screens.
Lake County against the rest of MI
Lake County has the 75th longest season of 83 MI counties, at 142 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 44.5°F.
- Alcona County: May 17 to October 7 (143 days, 0 WNV)
- Marquette County: May 15 to October 4 (142 days, 1 WNV)
- Gogebic County: May 12 to September 30 (141 days, 0 WNV)
- Luce County: May 14 to October 2 (141 days, 0 WNV)
West Nile in Lake County
CDC ArboNET lists no human West Nile cases for Lake County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
See how the dates are worked out, and when the season starts across the US.