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

Mosquito months in Clarke County

In a normal year mosquito season in Clarke County, VA starts around April 12 and ends around October 29, 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 Clarke County, and when

• Start tipping out standing water weekly by March 29.
• Book any yard treatment for mid April, ahead of the July peak.
• Repellent can go away after October 29.
• No West Nile cases since 2016, so bites in Clarke County are a nuisance; check window screens.

Clarke County against the rest of VA

Clarke County has the 107th longest season of 133 VA counties, at 200 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 53.8°F.

• Lee County: April 10 to October 29 (202 days, 0 WNV)
• Pulaski County: April 9 to October 27 (201 days, 0 WNV)
• Louisa County: April 12 to October 29 (200 days, 1 WNV)
• Henry County: April 13 to October 30 (200 days, 0 WNV)

West Nile in Clarke County

CDC ArboNET lists no human West Nile cases for Clarke County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.

Background: when the season starts across the US; how the dates are worked out.