Iron Mountain, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iron Mountain, a city in Dickinson County, Michigan.
Today
78°F
Mostly Cloudy then Chance Showers And Thunderstorms
A slight chance of rain showers between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then a slight chance of showers and thunderstorms. Mostly cloudy. High near 78, with temperatures falling to around 74 in the afternoon. West wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
7-day forecast for Iron Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph W | 29% |
| Tonight | 56°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 mph N | 16% |
| Wednesday | 77°F | Mostly Sunny | 0 to 5 mph NW | 3% |
| Wednesday Night | 53°F | Mostly Clear | 0 to 5 mph S | 4% |
| Thursday | 82°F | Sunny | 0 to 10 mph SW | 1% |
| Thursday Night | 60°F | Mostly Clear | 5 to 10 mph SW | 1% |
| Friday | 85°F | Sunny | 5 to 10 mph SW | 11% |
| Friday Night | 62°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 32% |
| Saturday | 82°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 27% |
| Saturday Night | 60°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 45% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 45% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 35% |
| Monday | 79°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 23% |
| Monday Night | 57°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph N | 24% |
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 Aug 4, 2026.