Mosquito season in Scott County, MO: when it starts and ends
Mosquito months in Scott County
In a normal year mosquito season in Scott County, MO starts around March 21 and ends around November 8, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Scott County, and when
- Start tipping out standing water weekly by March 7.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 8.
- No West Nile cases since 2016, so bites in Scott County are a nuisance; check window screens.
Scott County against the rest of MO
Scott County has the 5th longest season of 115 MO counties, at 232 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 58.3°F.
- New Madrid County: March 19 to November 10 (236 days, 1 WNV)
- Butler County: March 20 to November 9 (234 days, 3 WNV)
- Mississippi County: March 24 to November 9 (230 days, 0 WNV)
- St. Louis city: March 24 to November 8 (229 days, 39 WNV)
West Nile in Scott County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Scott County (1 neuroinvasive) across 3 years. The worst was 2011 with 1; the latest was 2011.
Background: when the season starts across the US; how the dates are worked out.