Mosquito season in Linn County, KS: when it starts and ends
Mosquito months in Linn County
In a normal year mosquito season in Linn County, KS starts around April 2 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Linn County, and when
- Start tipping out standing water weekly by March 19.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- 1 West Nile case since 2016 (last 2019): you should use repellent at dusk June to August, more so if over 60.
Linn County against the rest of KS
Linn County has the 19th longest season of 105 KS counties, at 213 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55°F.
- Dickinson County: April 2 to November 2 (214 days, 6 WNV)
- Morris County: April 1 to October 31 (213 days, 0 WNV)
- Osage County: April 2 to November 1 (213 days, 0 WNV)
- Butler County: April 3 to November 2 (213 days, 6 WNV)
West Nile in Linn County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Linn County (0 neuroinvasive) across 2 years. The worst was 2019 with 1; the latest was 2019.
Background: when the season starts across the US; how the dates are worked out.