Mosquito season in Lincoln County, WA: when it starts and ends
Mosquito months in Lincoln County
In a normal year mosquito season in Lincoln County, WA starts around May 9 and ends around October 1, about 21 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 April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 1.
- No West Nile cases since 2016, so bites in Lincoln County are a nuisance; check window screens.
Lincoln County against the rest of WA
Lincoln County has the 36th longest season of 39 WA counties, at 145 days against 205 in Walla Walla County and 132 in Asotin County. Its mean temperature is 46.2°F.
- Stevens County: April 30 to September 28 (151 days, 0 WNV)
- Pend Oreille County: May 4 to September 28 (147 days, 0 WNV)
- Chelan County: May 11 to September 30 (142 days, 0 WNV)
- Ferry County: May 12 to September 24 (135 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 3 of those years.
More: how the dates are worked out · when the season starts across the US.