Mosquito season in Ripley County, MO: when it starts and ends
Mosquito months in Ripley County
In a normal year mosquito season in Ripley County, MO starts around March 31 and ends around November 3, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ripley County, and when
- Start tipping out standing water weekly by March 17.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 3.
- No West Nile cases since 2016, so bites in Ripley County are a nuisance; check window screens.
Ripley County against the rest of MO
Ripley County has the 35th longest season of 115 MO counties, at 217 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 57.6°F.
- Franklin County: March 31 to November 3 (217 days, 0 WNV)
- Jefferson County: March 31 to November 3 (217 days, 3 WNV)
- Iron County: March 31 to November 2 (216 days, 0 WNV)
- St. Charles County: March 31 to November 2 (216 days, 9 WNV)
West Nile in Ripley County
CDC ArboNET lists no human West Nile cases for Ripley County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
More: how the dates are worked out · when the season starts across the US.