Mosquito season in Meagher County, MT: when it starts and ends
Mosquito months in Meagher County
In a normal year mosquito season in Meagher County, MT starts around May 22 and ends around September 25, about 18 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Meagher County, and when
- Start tipping out standing water weekly by May 8.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 25.
- No West Nile cases since 2016, so bites in Meagher County are a nuisance; check window screens.
Meagher County against the rest of MT
Meagher County has the 42nd longest season of 56 MT counties, at 126 days against 163 in Dawson County and 89 in Gallatin County. Its mean temperature is 41.5°F.
- Lewis and Clark County: May 20 to September 26 (128 days, 6 WNV)
- Madison County: May 22 to September 26 (127 days, 1 WNV)
- Ravalli County: May 22 to September 24 (125 days, 1 WNV)
- Lincoln County: May 16 to September 15 (122 days, 0 WNV)
West Nile in Meagher County
CDC ArboNET lists no human West Nile cases for Meagher County from 1999 to 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.