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

Mosquito months in Dickinson County

In a normal year mosquito season in Dickinson County, KS starts around April 2 and ends around November 2, about 31 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 Dickinson County, and when

• Start tipping out standing water weekly by March 19.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 2.
• 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.

Dickinson County against the rest of KS

Dickinson County has the 17th longest season of 105 KS counties, at 214 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 56.8°F.

• Johnson County: April 1 to November 1 (214 days, 25 WNV)
• Coffey County: April 2 to November 2 (214 days, 0 WNV)
• Morris County: April 1 to October 31 (213 days, 0 WNV)
• Linn County: April 2 to November 1 (213 days, 1 WNV)

West Nile in Dickinson County

From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Dickinson County (9 neuroinvasive) across 12 years. The worst was 2013 with 4; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.