Mosquito season in Allen County, KS: when it starts and ends
Mosquito months in Allen County
In a normal year mosquito season in Allen County, KS starts around March 30 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Allen 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 4.
- No West Nile cases since 2016, so bites in Allen County are a nuisance; check window screens.
Allen County against the rest of KS
Allen County has the 8th longest season of 105 KS counties, at 219 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 56°F.
- Chautauqua County: March 29 to November 4 (220 days, 0 WNV)
- Sedgwick County: March 30 to November 5 (220 days, 28 WNV)
- Harper County: March 31 to November 5 (219 days, 1 WNV)
- Marion County: March 30 to November 3 (218 days, 0 WNV)
West Nile in Allen County
CDC ArboNET lists no human West Nile cases for Allen County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.