Mosquito season in Chesterfield County, VA: when it starts and ends
Mosquito months in Chesterfield County
In a normal year mosquito season in Chesterfield County, VA starts around March 22 and ends around November 15, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chesterfield County, and when
- Start tipping out standing water weekly by March 8.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 15.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to September, more so if over 60.
Chesterfield County against the rest of VA
Chesterfield County has the 19th longest season of 133 VA counties, at 238 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 59.4°F.
- Petersburg city: March 20 to November 14 (239 days, 1 WNV)
- Colonial Heights city: March 20 to November 14 (238 days, 0 WNV)
- Northampton County: March 26 to November 19 (238 days, 0 WNV)
- Accomack County: March 25 to November 17 (237 days, 0 WNV)
West Nile in Chesterfield County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Chesterfield County (3 neuroinvasive) across 3 years. The worst was 2012 with 2; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.