Mosquito season in McPherson County, KS: when it starts and ends
Mosquito months in McPherson County
In a normal year mosquito season in McPherson County, KS starts around April 6 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in McPherson County, and when
- Start tipping out standing water weekly by March 23.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
McPherson County against the rest of KS
McPherson County has the 33rd longest season of 105 KS counties, at 209 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.7°F.
- Wyandotte County: April 5 to October 31 (209 days, 5 WNV)
- Anderson County: April 6 to November 1 (209 days, 0 WNV)
- Douglas County: April 5 to October 30 (208 days, 7 WNV)
- Greenwood County: April 5 to October 30 (208 days, 0 WNV)
West Nile in McPherson County
From 1999 to 2025, CDC ArboNET counted 15 human West Nile cases in McPherson County (8 neuroinvasive) across 10 years. The worst was 2003 with 3; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.