Mosquito season in Morton County, KS: when it starts and ends
Mosquito months in Morton County
In a normal year mosquito season in Morton County, KS starts around April 16 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morton County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Morton County against the rest of KS
Morton County has the 80th longest season of 105 KS counties, at 193 days against 227 in Cherokee County and 178 in Thomas County. Its mean temperature is 55.6°F.
- Smith County: April 13 to October 24 (194 days, 0 WNV)
- Barton County: April 14 to October 25 (194 days, 8 WNV)
- Washington County: April 14 to October 23 (192 days, 2 WNV)
- Marshall County: April 14 to October 22 (191 days, 2 WNV)
West Nile in Morton County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Morton County (1 neuroinvasive) across 1 year. The worst was 2023 with 1; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.