Mosquito season in Louisa County, IA: when it starts and ends
Mosquito months in Louisa County
In a normal year mosquito season in Louisa County, IA starts around April 15 and ends around October 20, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Louisa 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 20.
- No West Nile cases since 2016, so bites in Louisa County are a nuisance; check window screens.
Louisa County against the rest of IA
Louisa County has the 20th longest season of 99 IA counties, at 188 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 49.5°F.
- Taylor County: April 15 to October 21 (189 days, 0 WNV)
- Jefferson County: April 15 to October 20 (188 days, 0 WNV)
- Pottawattamie County: April 16 to October 21 (188 days, 18 WNV)
- Wayne County: April 16 to October 20 (188 days, 2 WNV)
West Nile in Louisa County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Louisa County (1 neuroinvasive) across 2 years. The worst was 2015 with 1; the latest was 2015.
Background: when the season starts across the US; how the dates are worked out.