Mosquito season in Northumberland County, VA: when it starts and ends
Mosquito months in Northumberland County
In a normal year mosquito season in Northumberland County, VA starts around March 25 and ends around November 14, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Northumberland County, and when
- Start tipping out standing water weekly by March 11.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 14.
- 1 West Nile case since 2016 (last 2019): you should use repellent at dusk June to September, more so if over 60.
Northumberland County against the rest of VA
Northumberland County has the 26th 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.
- Richmond city: March 23 to November 11 (234 days, 6 WNV)
- Lancaster County: March 24 to November 13 (234 days, 0 WNV)
- Gloucester County: March 26 to November 14 (234 days, 0 WNV)
- Surry County: March 26 to November 14 (233 days, 0 WNV)
West Nile in Northumberland County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Northumberland County (1 neuroinvasive) across 1 year. The worst was 2019 with 1; the latest was 2019.
More: how the dates are worked out · when mosquitoes go away for the winter.