Mosquito season in Ness County, KS: when it starts and ends
Mosquito months in Ness County
In a normal year mosquito season in Ness County, KS starts around April 18 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ness County, and when
- Start tipping out standing water weekly by April 4.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- 7 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Ness County against the rest of KS
Ness County has the 89th longest season of 105 KS counties, at 187 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 53.9°F.
- Wallace County: April 17 to October 22 (188 days, 4 WNV)
- Lane County: April 18 to October 23 (188 days, 3 WNV)
- Graham County: April 19 to October 22 (186 days, 2 WNV)
- Osborne County: April 19 to October 22 (186 days, 1 WNV)
West Nile in Ness County
From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Ness County (3 neuroinvasive) across 7 years. The worst was 2016 with 4; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.