Mosquito season in Vernon County, MO: when it starts and ends
Mosquito months in Vernon County
In a normal year mosquito season in Vernon County, MO starts around March 29 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Vernon County, and when
- Start tipping out standing water weekly by March 15.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 4.
- 2 West Nile cases since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.
Vernon County against the rest of MO
Vernon County has the 23rd longest season of 115 MO counties, at 220 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 56.1°F.
- Reynolds County: March 28 to November 3 (220 days, 0 WNV)
- Cape Girardeau County: March 29 to November 4 (220 days, 1 WNV)
- Carter County: March 28 to November 2 (219 days, 1 WNV)
- Morgan County: March 29 to November 3 (219 days, 0 WNV)
West Nile in Vernon County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Vernon County (3 neuroinvasive) across 3 years. The worst was 2022 with 1; the latest was 2022.
More: how the dates are worked out · when mosquitoes go away for the winter.