Mosquito season in Richmond city, VA: when it starts and ends
Mosquito months in Richmond city
In a normal year mosquito season in Richmond city, VA starts around March 23 and ends around November 11, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Richmond city, 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 11.
- 6 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.
Richmond city against the rest of VA
Richmond city has the 24th longest season of 133 VA counties, at 234 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 58.3°F.
- Henrico County: March 22 to November 13 (236 days, 6 WNV)
- Middlesex County: March 23 to November 14 (236 days, 0 WNV)
- Lancaster County: March 24 to November 13 (234 days, 0 WNV)
- Northumberland County: March 25 to November 14 (234 days, 1 WNV)
West Nile in Richmond city
From 1999 to 2025, CDC ArboNET counted 15 human West Nile cases in Richmond city (11 neuroinvasive) across 11 years. The worst was 2002 with 3; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.