Mosquito season in Putnam County, NY: when it starts and ends
Mosquito months in Putnam County
In a normal year mosquito season in Putnam County, NY starts around April 19 and ends around October 21, about 26 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 April 5.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 21.
- No West Nile cases since 2016, so bites in Putnam County are a nuisance; check window screens.
Putnam County against the rest of NY
Putnam County has the 10th longest season of 62 NY counties, at 184 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 49.5°F.
- Westchester County: April 19 to October 24 (188 days, 42 WNV)
- Rockland County: April 20 to October 23 (186 days, 6 WNV)
- Orange County: April 20 to October 20 (183 days, 0 WNV)
- Ulster County: April 20 to October 20 (183 days, 2 WNV)
West Nile in Putnam County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Putnam County (0 neuroinvasive) across 1 year. The worst was 2011 with 1; the latest was 2011.
See how the dates are worked out, and when mosquitoes go away for the winter.