Mosquito season in Sedgwick County, KS: when it starts and ends
Mosquito months in Sedgwick County
In a normal year mosquito season in Sedgwick County, KS starts around March 30 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Sedgwick County, and when
- Start tipping out standing water weekly by March 16.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- 28 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to September, and check KS spray notices.
Sedgwick County against the rest of KS
Sedgwick County has the 7th longest season of 105 KS counties, at 220 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 57.4°F.
- Neosho County: March 29 to November 5 (221 days, 0 WNV)
- Chautauqua County: March 29 to November 4 (220 days, 0 WNV)
- Allen County: March 30 to November 4 (219 days, 0 WNV)
- Harper County: March 31 to November 5 (219 days, 1 WNV)
West Nile in Sedgwick County
From 1999 to 2025, CDC ArboNET counted 117 human West Nile cases in Sedgwick County (58 neuroinvasive) across 21 years. The worst was 2012 with 21; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.