Mosquito season in Marshall County, KS: when it starts and ends
Mosquito months in Marshall County
In a normal year mosquito season in Marshall County, KS starts around April 14 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marshall County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Marshall County against the rest of KS
Marshall County has the 82nd longest season of 105 KS counties, at 191 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 52.7°F.
- Morton County: April 16 to October 26 (193 days, 1 WNV)
- Washington County: April 14 to October 23 (192 days, 2 WNV)
- Phillips County: April 15 to October 23 (191 days, 1 WNV)
- Grant County: April 16 to October 24 (191 days, 5 WNV)
West Nile in Marshall County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Marshall County (4 neuroinvasive) across 4 years. The worst was 2013 with 2; the latest was 2023.
Background: when mosquitoes go away for the winter; how the dates are worked out.