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
81°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 81, with temperatures falling to around 77 in the afternoon. West northwest wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Green Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Chance Showers And Thunderstorms | 8 mph WNW | 34% |
| Tonight | 60°F | Showers And Thunderstorms | 6 to 9 mph N | 76% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 6 mph NE | 55% |
| Wednesday Night | 55°F | Chance Rain Showers | 3 mph NNE | 26% |
| Thursday | 80°F | Sunny | 2 mph ENE | 2% |
| Thursday Night | 59°F | Mostly Clear | 2 mph SE | 0% |
| Friday | 83°F | Sunny | 2 to 7 mph SSE | 7% |
| Friday Night | 65°F | Mostly Clear | 6 mph S | 12% |
| Saturday | 86°F | Sunny | 3 to 8 mph S | 11% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 10 mph SSW | 16% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph S | 16% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 9 mph SSE | 34% |
| Monday | 86°F | Chance Showers And Thunderstorms | 8 to 12 mph S | 34% |
| Monday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph E | 31% |
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 Aug 4, 2026.