Green Mountain, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Green Mountain, a community in Marshall County, Iowa.
Today
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Southwest wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Green Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Chance Showers And Thunderstorms | 8 mph SW | 45% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 6 to 10 mph N | 47% |
| Sunday | 66°F | Chance Rain Showers | 10 to 14 mph NE | 36% |
| Sunday Night | 54°F | Chance Rain Showers | 13 mph ENE | 45% |
| Monday | 62°F | Chance Rain Showers | 13 mph NE | 45% |
| Monday Night | 49°F | Chance Rain Showers | 10 mph NE | 45% |
| Tuesday | 60°F | Slight Chance Rain Showers then Partly Sunny | 9 mph ENE | 20% |
| Tuesday Night | 45°F | Partly Cloudy | 3 to 7 mph ENE | 3% |
| Wednesday | 65°F | Sunny | 5 mph ENE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 3 mph E | 4% |
| Thursday | 66°F | Partly Sunny | 3 mph E | 12% |
| Thursday Night | 53°F | Mostly Cloudy | 2 mph E | 10% |
| Friday | 68°F | Partly Sunny | 5 mph E | 6% |
| Friday Night | 54°F | Mostly Cloudy | 3 mph ESE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Green Mountain (42.102, -92.820). Updated through the day.
Growing snapshot for Green Mountain
Last spring frost
Apr 28
First fall frost
Oct 7
Growing season
162 days
Hardiness zone
5a
More local growing data for Green Mountain: nearby ZIP 50158 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Albion
Clemons
Ferguson
Gilman
Haverhill
Laurel
Le Grand
Liscomb
Marshalltown
Melbourne
Rhodes
St. Anthony
State Center
Climate data from the nearest NOAA station, Marshalltown, Ia (1.6 mi from Green Mountain). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.