Mosquito season in Lincoln County, MT: when it starts and ends
Mosquito months in Lincoln County
In a normal year mosquito season in Lincoln County, MT starts around May 16 and ends around September 15, about 17 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lincoln County, and when
- Start tipping out standing water weekly by May 2.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 15.
- No West Nile cases since 2016, so bites in Lincoln County are a nuisance; check window screens.
Lincoln County against the rest of MT
Lincoln County has the 44th longest season of 56 MT counties, at 122 days against 163 in Dawson County and 89 in Gallatin County. Its mean temperature is 44.9°F.
- Meagher County: May 22 to September 25 (126 days, 0 WNV)
- Ravalli County: May 22 to September 24 (125 days, 1 WNV)
- Jefferson County: May 22 to September 21 (122 days, 1 WNV)
- Missoula County: May 23 to September 22 (122 days, 0 WNV)
West Nile in Lincoln County
CDC ArboNET lists no human West Nile cases for Lincoln County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.