Mosquito season in Barry County, MO: when it starts and ends
Mosquito months in Barry County
In a normal year mosquito season in Barry County, MO starts around April 3 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Barry County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 5.
- No West Nile cases since 2016, so bites in Barry County are a nuisance; check window screens.
Barry County against the rest of MO
Barry County has the 39th longest season of 115 MO counties, at 216 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.8°F.
- St. Charles County: March 31 to November 2 (216 days, 9 WNV)
- Ozark County: April 2 to November 4 (216 days, 0 WNV)
- Dade County: March 31 to November 1 (215 days, 0 WNV)
- McDonald County: March 31 to November 1 (215 days, 0 WNV)
West Nile in Barry County
CDC ArboNET lists no human West Nile cases for Barry County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.