Mosquito season in Grand Traverse County, MI: when it starts and ends
Mosquito months in Grand Traverse County
In a normal year mosquito season in Grand Traverse County, MI starts around May 3 and ends around October 14, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Grand Traverse County, and when
- Start tipping out standing water weekly by April 19.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 14.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk July, more so if over 60.
Grand Traverse County against the rest of MI
Grand Traverse County has the 39th longest season of 83 MI counties, at 164 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 46.5°F.
- Oceana County: May 2 to October 13 (164 days, 0 WNV)
- Benzie County: May 3 to October 14 (164 days, 0 WNV)
- Mason County: May 2 to October 11 (163 days, 0 WNV)
- Muskegon County: May 5 to October 15 (163 days, 2 WNV)
West Nile in Grand Traverse County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Grand Traverse County (4 neuroinvasive) across 2 years. The worst was 2005 with 3; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.