Mosquito season in Sherman County, KS: when it starts and ends
Mosquito months in Sherman County
In a normal year mosquito season in Sherman County, KS starts around April 23 and ends around October 19, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Sherman County, and when
- Start tipping out standing water weekly by April 9.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 5 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Sherman County against the rest of KS
Sherman County has the 103rd longest season of 105 KS counties, at 179 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 51.7°F.
- Wichita County: April 23 to October 21 (181 days, 0 WNV)
- Greeley County: April 23 to October 19 (179 days, 2 WNV)
- Rawlins County: April 22 to October 17 (178 days, 2 WNV)
- Thomas County: April 23 to October 18 (178 days, 4 WNV)
West Nile in Sherman County
From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Sherman County (5 neuroinvasive) across 6 years. The worst was 2013 with 3; the latest was 2023.
Background: reading the West Nile counts; how the dates are worked out.