Mosquito season in Stone County, MO: when it starts and ends
Mosquito months in Stone County
In a normal year mosquito season in Stone County, MO starts around April 4 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Stone 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 November 1.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Stone County against the rest of MO
Stone County has the 61st longest season of 115 MO counties, at 211 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 56.3°F.
- Warren County: April 3 to October 31 (211 days, 0 WNV)
- St. Clair County: April 4 to November 1 (211 days, 0 WNV)
- Audrain County: April 3 to October 30 (210 days, 1 WNV)
- Dent County: April 3 to October 30 (210 days, 0 WNV)
West Nile in Stone County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Stone County (1 neuroinvasive) across 1 year. The worst was 2025 with 2; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.