Iron Mountain, MI Weather & Growing Conditions
Tonight
46°F
Patchy Fog
Patchy fog between 11pm and 1am. Mostly cloudy, with a low around 46. North wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Patchy Fog | 0 to 5 mph N | 6% |
| Sunday | 62°F | Partly Sunny | 5 to 15 mph NE | 4% |
| Sunday Night | 38°F | Mostly Cloudy | 5 to 10 mph NE | 1% |
| Monday | 60°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Monday Night | 35°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Tuesday | 63°F | Sunny | 0 to 10 mph NE | 1% |
| Tuesday Night | 38°F | Mostly Clear | 0 to 5 mph E | 1% |
| Wednesday | 65°F | Sunny | 0 to 10 mph E | 2% |
| Wednesday Night | 42°F | Mostly Clear | 0 to 5 mph E | 2% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph E | 3% |
| Thursday Night | 44°F | Partly Cloudy | 0 to 5 mph E | 5% |
| Friday | 72°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Friday Night | 45°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Saturday | 73°F | Mostly Sunny | 0 to 5 mph SW | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Iron Mountain, MI
Last spring frost
May 25
First fall frost
Sep 24
Growing season
121 days
Hardiness zone
4b
Explore more for Iron Mountain, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Iron Mtn Ford Ap, Mi (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.