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

Mosquito months in Pottawatomie County

In a normal year mosquito season in Pottawatomie County, KS starts around April 8 and ends around October 28, 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 Pottawatomie County, and when

• Start tipping out standing water weekly by March 25.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 28.
• 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to August, more so if over 60.

Pottawatomie County against the rest of KS

Pottawatomie County has the 51st longest season of 105 KS counties, at 203 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 54.4°F.

• Chase County: April 7 to October 27 (203 days, 0 WNV)
• Cloud County: April 7 to October 27 (203 days, 0 WNV)
• Edwards County: April 9 to October 29 (203 days, 0 WNV)
• Ellis County: April 9 to October 29 (203 days, 5 WNV)

West Nile in Pottawatomie County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Pottawatomie County (3 neuroinvasive) across 3 years. The worst was 2003 with 2; the latest was 2018.

Background: when mosquitoes go away for the winter; how the dates are worked out.