Mosquito season in Decatur County, KS: when it starts and ends
Mosquito months in Decatur County
In a normal year mosquito season in Decatur County, KS starts around April 19 and ends around October 20, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Decatur County, and when
- Start tipping out standing water weekly by April 5.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 20.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Decatur County against the rest of KS
Decatur County has the 96th longest season of 105 KS counties, at 184 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 52.2°F.
- Rooks County: April 19 to October 21 (185 days, 2 WNV)
- Logan County: April 20 to October 22 (185 days, 1 WNV)
- Norton County: April 21 to October 21 (183 days, 4 WNV)
- Cheyenne County: April 20 to October 18 (181 days, 2 WNV)
West Nile in Decatur County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Decatur County (3 neuroinvasive) across 3 years. The worst was 2023 with 1; the latest was 2023.
Background: when mosquitoes go away for the winter; how the dates are worked out.