Mosquito season in Douglas County, KS: when it starts and ends
Mosquito months in Douglas County
In a normal year mosquito season in Douglas County, KS starts around April 5 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Douglas County, and when
- Start tipping out standing water weekly by March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- 7 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to August, more so if over 60.
Douglas County against the rest of KS
Douglas County has the 34th longest season of 105 KS counties, at 208 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 54.6°F.
- Anderson County: April 6 to November 1 (209 days, 0 WNV)
- McPherson County: April 6 to November 1 (209 days, 5 WNV)
- Greenwood County: April 5 to October 30 (208 days, 0 WNV)
- Rice County: April 6 to October 31 (208 days, 2 WNV)
West Nile in Douglas County
From 1999 to 2025, CDC ArboNET counted 19 human West Nile cases in Douglas County (11 neuroinvasive) across 13 years. The worst was 2005 with 5; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.