Marshalltown, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marshalltown, a city in Marshall County, Iowa.
Overnight
46°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 46, with temperatures rising to around 48 overnight. West wind around 12 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Marshalltown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Chance Rain Showers | 12 mph W | 26% |
| Wednesday | 53°F | Slight Chance Rain Showers | 12 to 15 mph W | 21% |
| Wednesday Night | 42°F | Cloudy then Slight Chance Rain Showers | 12 mph W | 16% |
| Thursday | 54°F | Chance Rain Showers then Cloudy | 10 mph NW | 54% |
| Thursday Night | 37°F | Mostly Cloudy | 8 mph N | 11% |
| Friday | 49°F | Mostly Sunny | 3 to 7 mph N | 3% |
| Friday Night | 29°F | Partly Cloudy | 2 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 3 mph WSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph W | 1% |
| Sunday | 58°F | Sunny | 5 mph W | 1% |
| Sunday Night | 36°F | Clear | 3 mph SW | 0% |
| Monday | 64°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 40°F | Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Marshalltown (42.034, -92.906). Updated through the day.
Growing snapshot for Marshalltown
Last spring frost
Apr 28
First fall frost
Oct 7
Growing season
162 days
Hardiness zone
5a
More local growing data for Marshalltown: nearby ZIP 50158 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Albion
Clemons
Ferguson
Gilman
Green Mountain
Haverhill
Laurel
Le Grand
Liscomb
Melbourne
Rhodes
St. Anthony
State Center
Climate data from the nearest NOAA station, Marshalltown, Ia (1.6 mi from Marshalltown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.