Mosquito season in Ottawa County, KS: when it starts and ends
Mosquito months in Ottawa County
In a normal year mosquito season in Ottawa County, KS starts around April 10 and ends around October 29, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ottawa County, and when
- Start tipping out standing water weekly by March 27.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- No West Nile cases since 2016, so bites in Ottawa County are a nuisance; check window screens.
Ottawa County against the rest of KS
Ottawa County has the 59th longest season of 105 KS counties, at 202 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55°F.
- Clay County: April 9 to October 28 (202 days, 2 WNV)
- Gray County: April 10 to October 29 (202 days, 10 WNV)
- Kiowa County: April 11 to October 30 (202 days, 0 WNV)
- Pawnee County: April 12 to October 31 (202 days, 1 WNV)
West Nile in Ottawa County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Ottawa County (1 neuroinvasive) across 1 year. The worst was 2013 with 1; the latest was 2013.
See how the dates are worked out, and when mosquitoes go away for the winter.