Mosquito season in Johnston County, OK: when it starts and ends
Mosquito months in Johnston County
In a normal year mosquito season in Johnston County, OK starts around March 13 and ends around November 14, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Johnston County, and when
- Start tipping out standing water weekly by February 27.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 14.
- No West Nile cases since 2016, so bites in Johnston County are a nuisance; check window screens.
Johnston County against the rest of OK
Johnston County has the 12th longest season of 77 OK counties, at 246 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 61.9°F.
- Atoka County: March 12 to November 14 (247 days, 0 WNV)
- Jefferson County: March 13 to November 14 (246 days, 0 WNV)
- McCurtain County: March 13 to November 14 (246 days, 0 WNV)
- Hughes County: March 15 to November 16 (246 days, 1 WNV)
West Nile in Johnston County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Johnston County (1 neuroinvasive) across 1 year. The worst was 2015 with 1; the latest was 2015.
Background: when the season starts across the US; how the dates are worked out.