Mosquito season in Wallace County, KS: when it starts and ends
Mosquito months in Wallace County
In a normal year mosquito season in Wallace County, KS starts around April 17 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wallace County, and when
- Start tipping out standing water weekly by April 3.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Wallace County against the rest of KS
Wallace County has the 87th longest season of 105 KS counties, at 188 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 52.9°F.
- Finney County: April 17 to October 25 (191 days, 7 WNV)
- Lincoln County: April 17 to October 23 (189 days, 1 WNV)
- Lane County: April 18 to October 23 (188 days, 3 WNV)
- Ness County: April 18 to October 22 (187 days, 7 WNV)
West Nile in Wallace County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Wallace County (3 neuroinvasive) across 4 years. The worst was 2023 with 2; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.