Mosquito season in Marquette County, MI: when it starts and ends
Mosquito months in Marquette County
In a normal year mosquito season in Marquette County, MI starts around May 15 and ends around October 4, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marquette County, and when
- Start tipping out standing water weekly by May 1.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 4.
- 1 West Nile case since 2016 (last 2019): you should use repellent at dusk July, more so if over 60.
Marquette County against the rest of MI
Marquette County has the 74th longest season of 83 MI counties, at 142 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 41.5°F.
- Mackinac County: May 12 to October 3 (144 days, 0 WNV)
- Alcona County: May 17 to October 7 (143 days, 0 WNV)
- Lake County: May 18 to October 7 (142 days, 0 WNV)
- Gogebic County: May 12 to September 30 (141 days, 0 WNV)
West Nile in Marquette County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Marquette County (1 neuroinvasive) across 2 years. The worst was 2019 with 1; the latest was 2019.
More: how the dates are worked out · when mosquitoes go away for the winter.