Iron Mountain, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iron Mountain, a city in Dickinson County, Michigan.
Tonight
47°F
Mostly Cloudy
Mostly cloudy, with a low around 47. North wind around 5 mph.
7-day forecast for Iron Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Mostly Cloudy | 5 mph N | 8% |
| Sunday | 62°F | Partly Sunny | 5 to 15 mph N | 3% |
| Sunday Night | 40°F | Mostly Cloudy | 5 to 10 mph NE | 1% |
| Monday | 59°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Monday Night | 38°F | Partly Cloudy | 5 to 10 mph NE | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Tuesday Night | 40°F | Mostly Clear | 0 to 5 mph E | 1% |
| Wednesday | 64°F | Sunny | 0 to 10 mph E | 2% |
| Wednesday Night | 44°F | Mostly Clear | 0 to 5 mph E | 2% |
| Thursday | 66°F | Mostly Sunny | 0 to 5 mph E | 3% |
| Thursday Night | 46°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 4% |
| Friday Night | 47°F | Partly Cloudy | 0 to 5 mph E | 2% |
| Saturday | 72°F | Mostly Sunny | 0 to 5 mph E | 4% |
Forecast source: National Weather Service (api.weather.gov) for Iron Mountain (45.827, -88.059). Updated through the day.
Growing snapshot for Iron Mountain
Last spring frost
May 17
First fall frost
Oct 1
Growing season
135 days
Hardiness zone
4b
More local growing data for Iron Mountain: nearby ZIP 49802 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Iron Mtn-Kingsford Wwtp, Mi (1 mi from Iron Mountain). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.