Mosquito season in Phelps County, MO: when it starts and ends
Mosquito months in Phelps County
In a normal year mosquito season in Phelps County, MO starts around March 28 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Phelps 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 4.
- 1 West Nile case since 2016 (last 2019): you should use repellent at dusk June to August, more so if over 60.
Phelps County against the rest of MO
Phelps County has the 20th longest season of 115 MO counties, at 220 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.9°F.
- Hickory County: March 29 to November 6 (222 days, 0 WNV)
- Boone County: March 27 to November 4 (221 days, 5 WNV)
- Reynolds County: March 28 to November 3 (220 days, 0 WNV)
- Cape Girardeau County: March 29 to November 4 (220 days, 1 WNV)
West Nile in Phelps County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Phelps County (3 neuroinvasive) across 3 years. The worst was 2019 with 1; the latest was 2019.
See how the dates are worked out, and when mosquitoes go away for the winter.