Mosquito season in Genesee County, NY: when it starts and ends
Mosquito months in Genesee County
In a normal year mosquito season in Genesee County, NY starts around April 27 and ends around October 17, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Genesee County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 17.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July to July, more so if over 60.
Genesee County against the rest of NY
Genesee County has the 22nd longest season of 62 NY counties, at 174 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 47.7°F.
- Ontario County: April 27 to October 20 (176 days, 1 WNV)
- Saratoga County: April 23 to October 16 (175 days, 3 WNV)
- Livingston County: April 27 to October 17 (173 days, 2 WNV)
- Onondaga County: April 27 to October 17 (173 days, 10 WNV)
West Nile in Genesee County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Genesee County (0 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.
More: how the dates are worked out · when the season starts across the US.