Mosquito season in Middlesex County, VA: when it starts and ends
Mosquito months in Middlesex County
In a normal year mosquito season in Middlesex County, VA starts around March 23 and ends around November 14, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Middlesex County, and when
- Start tipping out standing water weekly by March 9.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 14.
- No West Nile cases since 2016, so bites in Middlesex County are a nuisance; check window screens.
Middlesex County against the rest of VA
Middlesex County has the 23rd longest season of 133 VA counties, at 236 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 58.5°F.
- Accomack County: March 25 to November 17 (237 days, 0 WNV)
- Henrico County: March 22 to November 13 (236 days, 6 WNV)
- Richmond city: March 23 to November 11 (234 days, 6 WNV)
- Lancaster County: March 24 to November 13 (234 days, 0 WNV)
West Nile in Middlesex County
CDC ArboNET lists no human West Nile cases for Middlesex 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.