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

Mosquito months in Neosho County

In a normal year mosquito season in Neosho County, KS starts around March 29 and ends around November 5, about 32 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 Neosho County, and when

• Start tipping out standing water weekly by March 15.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 5.
• No West Nile cases since 2016, so bites in Neosho County are a nuisance; check window screens.

Neosho County against the rest of KS

Neosho County has the 5th longest season of 105 KS counties, at 221 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 56.6°F.

• Crawford County: March 27 to November 4 (223 days, 3 WNV)
• Bourbon County: March 28 to November 4 (221 days, 0 WNV)
• Chautauqua County: March 29 to November 4 (220 days, 0 WNV)
• Sedgwick County: March 30 to November 5 (220 days, 28 WNV)

West Nile in Neosho County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Neosho County (1 neuroinvasive) across 1 year. The worst was 2006 with 1; the latest was 2006.

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