Mosquito season in Orleans County, NY: when it starts and ends
Mosquito months in Orleans County
In a normal year mosquito season in Orleans County, NY starts around April 24 and ends around October 21, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Orleans County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 21.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk July to August, more so if over 60.
Orleans County against the rest of NY
Orleans County has the 14th longest season of 62 NY counties, at 180 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 49.2°F.
- Ulster County: April 20 to October 20 (183 days, 2 WNV)
- Chautauqua County: April 23 to October 23 (183 days, 0 WNV)
- Columbia County: April 22 to October 18 (179 days, 2 WNV)
- Monroe County: April 25 to October 20 (179 days, 13 WNV)
West Nile in Orleans County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Orleans County (2 neuroinvasive) across 2 years. The worst was 2024 with 1; the latest was 2024.
Background: when the season starts across the US; how the dates are worked out.