Iron Mountain, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iron Mountain, a city in Dickinson County, Michigan.
Overnight
56°F
Rain Showers
Rain showers and patchy fog. Cloudy, with a low around 56. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Iron Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Rain Showers | 10 mph SE | 91% |
| Wednesday | 61°F | Patchy Fog | 10 mph SE | 92% |
| Wednesday Night | 45°F | Rain Showers | 5 to 10 mph SW | 85% |
| Thursday | 50°F | Rain Showers | 5 to 15 mph NW | 97% |
| Thursday Night | 33°F | Slight Chance Rain Showers then Cloudy | 15 to 25 mph N | 20% |
| Friday | 42°F | Partly Sunny | 10 to 15 mph N | 10% |
| Friday Night | 26°F | Partly Cloudy | 0 to 5 mph NW | 3% |
| Saturday | 46°F | Mostly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 30°F | Partly Cloudy | 0 to 5 mph W | 11% |
| Sunday | 52°F | Mostly Sunny | 5 to 10 mph NW | 14% |
| Sunday Night | 32°F | Partly Cloudy | 5 to 10 mph W | 4% |
| Monday | 53°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 36°F | Partly Cloudy | 10 mph W | 2% |
| Tuesday | 52°F | Mostly Sunny | 10 to 15 mph NW | 1% |
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 Nov 4, 2026.