Mosquito season in Howell County, MO: when it starts and ends
Mosquito months in Howell County
In a normal year mosquito season in Howell County, MO starts around April 4 and ends around October 31, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Howell County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 31.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to August, more so if over 60.
Howell County against the rest of MO
Howell County has the 66th longest season of 115 MO counties, at 210 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.9°F.
- Lawrence County: April 3 to October 30 (210 days, 0 WNV)
- Randolph County: April 3 to October 30 (210 days, 1 WNV)
- Montgomery County: April 3 to October 30 (209 days, 0 WNV)
- Chariton County: April 4 to October 30 (209 days, 0 WNV)
West Nile in Howell County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Howell County (3 neuroinvasive) across 3 years. The worst was 2017 with 1; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.