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

Mosquito months in Henry County

In a normal year mosquito season in Henry County, VA starts around April 13 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 Henry County, and when

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

Henry County against the rest of VA

Henry County has the 109th longest season of 133 VA counties, at 200 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 56.7°F.

• Clarke County: April 12 to October 29 (200 days, 0 WNV)
• Louisa County: April 12 to October 29 (200 days, 1 WNV)
• Martinsville city: April 13 to October 30 (200 days, 0 WNV)
• Wythe County: April 10 to October 26 (199 days, 0 WNV)

West Nile in Henry County

CDC ArboNET lists no human West Nile cases for Henry County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.

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