Mosquito season in Warren County, VA: when it starts and ends
Mosquito months in Warren County
In a normal year mosquito season in Warren County, VA starts around April 4 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Warren County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Warren County against the rest of VA
Warren County has the 81st longest season of 133 VA counties, at 211 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 54.4°F.
- Madison County: April 3 to November 1 (212 days, 0 WNV)
- Scott County: April 4 to November 1 (211 days, 0 WNV)
- Loudoun County: April 4 to November 1 (210 days, 5 WNV)
- Culpeper County: April 5 to November 1 (210 days, 0 WNV)
West Nile in Warren County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Warren County (4 neuroinvasive) across 4 years. The worst was 2025 with 1; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.