Mosquito season in Union County, MS: when it starts and ends
Mosquito months in Union County
In a normal year mosquito season in Union County, MS starts around March 28 and ends around November 5, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Union County, and when
- Start tipping out standing water weekly by March 14.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Union County against the rest of MS
Union County has the 81st longest season of 82 MS counties, at 222 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 60.7°F.
- Marshall County: March 25 to November 7 (227 days, 0 WNV)
- Montgomery County: March 26 to November 7 (226 days, 1 WNV)
- Tishomingo County: March 29 to November 5 (221 days, 0 WNV)
West Nile in Union County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Union County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.