Mosquito season in Morris County, KS: when it starts and ends
Mosquito months in Morris County
In a normal year mosquito season in Morris County, KS starts around April 1 and ends around October 31, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morris County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 31.
- No West Nile cases since 2016, so bites in Morris County are a nuisance; check window screens.
Morris County against the rest of KS
Morris County has the 18th longest season of 105 KS counties, at 213 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.3°F.
- Coffey County: April 2 to November 2 (214 days, 0 WNV)
- Dickinson County: April 2 to November 2 (214 days, 6 WNV)
- Linn County: April 2 to November 1 (213 days, 1 WNV)
- Osage County: April 2 to November 1 (213 days, 0 WNV)
West Nile in Morris County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Morris County (0 neuroinvasive) across 2 years. The worst was 2013 with 1; the latest was 2013.
Background: when mosquitoes go away for the winter; how the dates are worked out.