Mosquito season in Putnam County, WV: when it starts and ends
Mosquito months in Putnam County
In a normal year mosquito season in Putnam County, WV starts around April 4 and ends around November 2, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Putnam 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 2.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Putnam County against the rest of WV
Putnam County has the 8th longest season of 55 WV counties, at 212 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 55.3°F.
- Boone County: April 3 to November 1 (212 days, 0 WNV)
- Wood County: April 3 to November 1 (212 days, 0 WNV)
- Summers County: April 3 to October 30 (210 days, 0 WNV)
- Wyoming County: April 4 to October 29 (208 days, 1 WNV)
West Nile in Putnam County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Putnam County (2 neuroinvasive) across 2 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.