Mosquito season in Louisa County, VA: when it starts and ends
Mosquito months in Louisa County
In a normal year mosquito season in Louisa County, VA starts around April 12 and ends around October 29, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Louisa County, and when
- Start tipping out standing water weekly by March 29.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 29.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Louisa County against the rest of VA
Louisa County has the 108th longest season of 133 VA counties, at 200 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 55.8°F.
- Pulaski County: April 9 to October 27 (201 days, 0 WNV)
- Clarke County: April 12 to October 29 (200 days, 0 WNV)
- Henry County: April 13 to October 30 (200 days, 0 WNV)
- Martinsville city: April 13 to October 30 (200 days, 0 WNV)
West Nile in Louisa County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Louisa County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.