Mosquito season in Scott County, IA: when it starts and ends
Mosquito months in Scott County
In a normal year mosquito season in Scott County, IA starts around April 14 and ends around October 21, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Scott County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 21.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Scott County against the rest of IA
Scott County has the 11th longest season of 99 IA counties, at 190 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 49.9°F.
- Van Buren County: April 14 to October 22 (191 days, 1 WNV)
- Page County: April 14 to October 21 (190 days, 2 WNV)
- Mahaska County: April 15 to October 21 (190 days, 1 WNV)
- Montgomery County: April 15 to October 22 (190 days, 3 WNV)
West Nile in Scott County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Scott County (7 neuroinvasive) across 7 years. The worst was 2002 with 3; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.