Mosquito season in Muskegon County, MI: when it starts and ends
Mosquito months in Muskegon County
In a normal year mosquito season in Muskegon County, MI starts around May 5 and ends around October 15, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Muskegon County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 15.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Muskegon County against the rest of MI
Muskegon County has the 41st longest season of 83 MI counties, at 163 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 47°F.
- Grand Traverse County: May 3 to October 14 (164 days, 1 WNV)
- Mason County: May 2 to October 11 (163 days, 0 WNV)
- Huron County: May 6 to October 16 (163 days, 0 WNV)
- Newaygo County: May 1 to October 11 (162 days, 1 WNV)
West Nile in Muskegon County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Muskegon County (6 neuroinvasive) across 5 years. The worst was 2006 with 3; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.