Mosquito season in Livingston County, MI: when it starts and ends
Mosquito months in Livingston County
In a normal year mosquito season in Livingston 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 Livingston 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.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Livingston County against the rest of MI
Livingston County has the 26th longest season of 83 MI counties, at 172 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 47.5°F.
- Shiawassee County: April 27 to October 16 (173 days, 1 WNV)
- Eaton County: April 26 to October 15 (172 days, 2 WNV)
- Washtenaw County: April 27 to October 16 (172 days, 3 WNV)
- Genesee County: April 27 to October 15 (171 days, 9 WNV)
West Nile in Livingston County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Livingston County (3 neuroinvasive) across 4 years. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.