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

Mosquito months in Lancaster County

In a normal year mosquito season in Lancaster County, VA starts around March 24 and ends around November 13, about 33 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 Lancaster County, and when

• Start tipping out standing water weekly by March 10.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 13.
• No West Nile cases since 2016, so bites in Lancaster County are a nuisance; check window screens.

Lancaster County against the rest of VA

Lancaster County has the 25th longest season of 133 VA counties, at 234 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 58.2°F.

• Middlesex County: March 23 to November 14 (236 days, 0 WNV)
• Richmond city: March 23 to November 11 (234 days, 6 WNV)
• Northumberland County: March 25 to November 14 (234 days, 1 WNV)
• Gloucester County: March 26 to November 14 (234 days, 0 WNV)

West Nile in Lancaster County

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

Background: when mosquitoes go away for the winter; how the dates are worked out.