Mosquito season in Pawnee County, KS: when it starts and ends

Mosquito months in Pawnee County

In a normal year mosquito season in Pawnee County, KS starts around April 12 and ends around October 31, about 29 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Pawnee County, and when

• Start tipping out standing water weekly by March 29.
• Book any yard treatment for mid April, ahead of the July peak.
• Repellent can go away after October 31.
• 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.

Pawnee County against the rest of KS

Pawnee County has the 61st longest season of 105 KS counties, at 202 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.7°F.

• Ottawa County: April 10 to October 29 (202 days, 0 WNV)
• Kiowa County: April 11 to October 30 (202 days, 0 WNV)
• Brown County: April 8 to October 26 (201 days, 1 WNV)
• Leavenworth County: April 9 to October 27 (201 days, 2 WNV)

West Nile in Pawnee County

From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Pawnee County (3 neuroinvasive) across 5 years. The worst was 2014 with 3; the latest was 2024.

See how the dates are worked out, and when mosquitoes go away for the winter.