Mosquito season in Chase County, KS: when it starts and ends
Mosquito months in Chase County
In a normal year mosquito season in Chase County, KS starts around April 7 and ends around October 27, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chase County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 27.
- No West Nile cases since 2016, so bites in Chase County are a nuisance; check window screens.
Chase County against the rest of KS
Chase County has the 49th longest season of 105 KS counties, at 203 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.1°F.
- Pratt County: April 9 to October 30 (204 days, 6 WNV)
- Stevens County: April 9 to October 30 (204 days, 4 WNV)
- Cloud County: April 7 to October 27 (203 days, 0 WNV)
- Pottawatomie County: April 8 to October 28 (203 days, 1 WNV)
West Nile in Chase County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Chase County (1 neuroinvasive) across 2 years. The worst was 2006 with 1; the latest was 2006.
More: how the dates are worked out · when mosquitoes go away for the winter.