Mosquito season in Marion County, MS: when it starts and ends
Mosquito months in Marion County
In a normal year mosquito season in Marion County, MS starts around February 19 and ends around December 4, about 41 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marion County, and when
- Start tipping out standing water weekly by February 5.
- Book any yard treatment for mid February, ahead of the July peak.
- Repellent can go away after December 4.
- 4 West Nile cases since 2016 (last 2018): you should use repellent at dusk May to September, more so if over 60.
Marion County against the rest of MS
Marion County has the 11th longest season of 82 MS counties, at 288 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 66.5°F.
- Jackson County: February 12 to December 8 (299 days, 11 WNV)
- Hancock County: February 16 to December 4 (291 days, 1 WNV)
- Issaquena County: February 21 to December 6 (288 days, 0 WNV)
- Humphreys County: February 19 to December 4 (287 days, 3 WNV)
West Nile in Marion County
From 1999 to 2025, CDC ArboNET counted 30 human West Nile cases in Marion County (11 neuroinvasive) across 10 years. The worst was 2006 with 7; the latest was 2018.
More: how the dates are worked out · reading the West Nile counts.