Mosquito season in Carter County, MO: when it starts and ends
Mosquito months in Carter County
In a normal year mosquito season in Carter County, MO starts around March 28 and ends around November 2, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carter County, and when
- Start tipping out standing water weekly by March 14.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 2.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Carter County against the rest of MO
Carter County has the 24th longest season of 115 MO counties, at 219 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.9°F.
- Cape Girardeau County: March 29 to November 4 (220 days, 1 WNV)
- Vernon County: March 29 to November 4 (220 days, 2 WNV)
- Morgan County: March 29 to November 3 (219 days, 0 WNV)
- Ste. Genevieve County: March 29 to November 3 (219 days, 0 WNV)
West Nile in Carter County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Carter County (1 neuroinvasive) across 1 year. The worst was 2023 with 1; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.