Mosquito season in Laclede County, MO: when it starts and ends
Mosquito months in Laclede County
In a normal year mosquito season in Laclede County, MO starts around April 4 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Laclede County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- 4 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Laclede County against the rest of MO
Laclede County has the 69th longest season of 115 MO counties, at 209 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.8°F.
- Montgomery County: April 3 to October 30 (209 days, 0 WNV)
- Chariton County: April 4 to October 30 (209 days, 0 WNV)
- Henry County: April 5 to October 31 (209 days, 2 WNV)
- Carroll County: April 4 to October 29 (208 days, 0 WNV)
West Nile in Laclede County
From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Laclede County (11 neuroinvasive) across 10 years. The worst was 2023 with 2; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.