Mosquito season in Eaton County, MI: when it starts and ends
Mosquito months in Eaton County
In a normal year mosquito season in Eaton County, MI starts around April 26 and ends around October 15, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Eaton County, and when
- Start tipping out standing water weekly by April 12.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 15.
- 2 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to July, more so if over 60.
Eaton County against the rest of MI
Eaton County has the 25th longest season of 83 MI counties, at 172 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 47.4°F.
- Lapeer County: April 27 to October 17 (173 days, 2 WNV)
- Shiawassee County: April 27 to October 16 (173 days, 1 WNV)
- Livingston County: April 26 to October 15 (172 days, 3 WNV)
- Washtenaw County: April 27 to October 16 (172 days, 3 WNV)
West Nile in Eaton County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Eaton County (5 neuroinvasive) across 5 years. The worst was 2024 with 1; the latest was 2024.
More: how the dates are worked out · when the season starts across the US.