Mosquito season in Cheyenne County, KS: when it starts and ends
Mosquito months in Cheyenne County
In a normal year mosquito season in Cheyenne County, KS starts around April 20 and ends around October 18, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cheyenne County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 18.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Cheyenne County against the rest of KS
Cheyenne County has the 98th longest season of 105 KS counties, at 181 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 51.9°F.
- Decatur County: April 19 to October 20 (184 days, 1 WNV)
- Norton County: April 21 to October 21 (183 days, 4 WNV)
- Hamilton County: April 21 to October 19 (181 days, 3 WNV)
- Rush County: April 21 to October 19 (181 days, 0 WNV)
West Nile in Cheyenne County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Cheyenne County (3 neuroinvasive) across 2 years. The worst was 2023 with 2; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.