Mosquito season in Mineral County, MT: when it starts and ends
Mosquito months in Mineral County
In a normal year mosquito season in Mineral County, MT starts around May 12 and ends around September 30, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Mineral County, and when
- Start tipping out standing water weekly by April 28.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 30.
- No West Nile cases since 2016, so bites in Mineral County are a nuisance; check window screens.
Mineral County against the rest of MT
Mineral County has the 26th longest season of 56 MT counties, at 141 days against 163 in Dawson County and 89 in Gallatin County. Its mean temperature is 44.3°F.
- Chouteau County: May 9 to September 29 (143 days, 1 WNV)
- Big Horn County: May 10 to September 28 (141 days, 4 WNV)
- Park County: May 14 to October 1 (140 days, 1 WNV)
- Teton County: May 14 to September 29 (139 days, 1 WNV)
West Nile in Mineral County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Mineral County (0 neuroinvasive) across 1 year. The worst was 2007 with 1; the latest was 2007.
More: how the dates are worked out · when the season starts across the US.