Mosquito season in Orange County, NY: when it starts and ends
Mosquito months in Orange County
In a normal year mosquito season in Orange County, NY starts around April 20 and ends around October 20, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Orange County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 20.
- No West Nile cases since 2016, so bites in Orange County are a nuisance; check window screens.
Orange County against the rest of NY
Orange County has the 11th longest season of 62 NY counties, at 183 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 49.6°F.
- Rockland County: April 20 to October 23 (186 days, 6 WNV)
- Putnam County: April 19 to October 21 (184 days, 0 WNV)
- Ulster County: April 20 to October 20 (183 days, 2 WNV)
- Chautauqua County: April 23 to October 23 (183 days, 0 WNV)
West Nile in Orange County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Orange County (1 neuroinvasive) across 2 years. The worst was 2013 with 1; the latest was 2013.
Background: when the season starts across the US; how the dates are worked out.