Mosquito season in Montgomery County, IA: when it starts and ends
Mosquito months in Montgomery County
In a normal year mosquito season in Montgomery County, IA starts around April 15 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Montgomery County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- 3 West Nile cases since 2016 (last 2021): you should use repellent at dusk June to August, more so if over 60.
Montgomery County against the rest of IA
Montgomery County has the 13th longest season of 99 IA counties, at 190 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 50.5°F.
- Scott County: April 14 to October 21 (190 days, 3 WNV)
- Mahaska County: April 15 to October 21 (190 days, 1 WNV)
- Polk County: April 14 to October 20 (189 days, 25 WNV)
- Warren County: April 14 to October 21 (189 days, 7 WNV)
West Nile in Montgomery County
From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Montgomery County (8 neuroinvasive) across 10 years. The worst was 2021 with 2; the latest was 2021.
More: how the dates are worked out · when the season starts across the US.