Mosquito season in Washington County, VA: when it starts and ends

Mosquito months in Washington County

In a normal year mosquito season in Washington County, VA starts around April 7 and ends around October 30, about 29 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Washington County, and when

• Start tipping out standing water weekly by March 24.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 30.
• No West Nile cases since 2016, so bites in Washington County are a nuisance; check window screens.

Washington County against the rest of VA

Washington County has the 93rd longest season of 133 VA counties, at 206 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 54.2°F.

• Staunton city: April 6 to October 30 (207 days, 0 WNV)
• Winchester city: April 6 to October 30 (207 days, 4 WNV)
• Amherst County: April 9 to November 1 (206 days, 0 WNV)
• Pittsylvania County: April 9 to November 1 (206 days, 0 WNV)

West Nile in Washington County

CDC ArboNET lists no human West Nile cases for Washington County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.

See how the dates are worked out, and when the season starts across the US.