Mosquito season in Keya Paha County, NE: when it starts and ends
Mosquito months in Keya Paha County
In a normal year mosquito season in Keya Paha County, NE starts around May 1 and ends around October 9, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Keya Paha County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 9.
- No West Nile cases since 2016, so bites in Keya Paha County are a nuisance; check window screens.
Keya Paha County against the rest of NE
Keya Paha County has the 86th longest season of 93 NE counties, at 161 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 47.2°F.
- Blaine County: May 1 to October 10 (162 days, 1 WNV)
- Thomas County: May 1 to October 10 (162 days, 2 WNV)
- Custer County: May 2 to October 9 (160 days, 14 WNV)
- Garden County: May 2 to October 9 (160 days, 4 WNV)
West Nile in Keya Paha County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Keya Paha County (0 neuroinvasive) across 3 years. The worst was 2003 with 4; the latest was 2008.
Background: when mosquitoes go away for the winter; how the dates are worked out.