Mosquito season in Gray County, KS: when it starts and ends
Mosquito months in Gray County
In a normal year mosquito season in Gray County, KS starts around April 10 and ends around October 29, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gray 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 29.
- 10 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check KS spray notices.
Gray County against the rest of KS
Gray County has the 58th longest season of 105 KS counties, at 202 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.1°F.
- Mitchell County: April 8 to October 27 (202 days, 2 WNV)
- Clay County: April 9 to October 28 (202 days, 2 WNV)
- Ottawa County: April 10 to October 29 (202 days, 0 WNV)
- Kiowa County: April 11 to October 30 (202 days, 0 WNV)
West Nile in Gray County
From 1999 to 2025, CDC ArboNET counted 19 human West Nile cases in Gray County (13 neuroinvasive) across 12 years. The worst was 2023 with 4; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.