Lake Mills, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Mills, a city in Winnebago County, Iowa.
Overnight
44°F
Rain Showers Likely
Rain showers likely. Cloudy. Low around 44, with temperatures rising to around 46 overnight. Northwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Lake Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Rain Showers Likely | 13 mph NW | 64% |
| Wednesday | 49°F | Rain Showers Likely | 16 mph WNW | 65% |
| Wednesday Night | 41°F | Rain Showers Likely | 12 to 15 mph WNW | 66% |
| Thursday | 48°F | Chance Rain Showers then Cloudy | 12 to 15 mph NNW | 36% |
| Thursday Night | 32°F | Mostly Cloudy | 3 to 10 mph N | 7% |
| Friday | 45°F | Mostly Sunny | 2 to 6 mph NNE | 2% |
| Friday Night | 26°F | Partly Cloudy | 1 mph N | 0% |
| Saturday | 48°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 32°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 54°F | Sunny | 7 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 6 mph SW | 0% |
| Monday | 60°F | Mostly Sunny | 6 to 10 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 57°F | Mostly Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Lake Mills (43.417, -93.532). Updated through the day.
Growing snapshot for Lake Mills
Last spring frost
Apr 30
First fall frost
Oct 7
Growing season
159 days
Hardiness zone
5a
More local growing data for Lake Mills: nearby ZIP 50450 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Forest City 2 Nne, Ia (10.9 mi from Lake Mills). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.