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

Mosquito months in Sheridan County

In a normal year mosquito season in Sheridan County, KS starts around April 10 and ends around October 25, about 28 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 Sheridan 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 25.
• No West Nile cases since 2016, so bites in Sheridan County are a nuisance; check window screens.

Sheridan County against the rest of KS

Sheridan County has the 70th longest season of 105 KS counties, at 199 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 53.5°F.

• Ford County: April 11 to October 28 (200 days, 9 WNV)
• Haskell County: April 12 to October 29 (200 days, 3 WNV)
• Russell County: April 12 to October 27 (198 days, 0 WNV)
• Republic County: April 12 to October 25 (196 days, 4 WNV)

West Nile in Sheridan County

CDC ArboNET lists no human West Nile cases for Sheridan County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.

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