Mountain Iron, MN Weather & Growing Conditions
This Afternoon
66°F
Mostly Cloudy
Mostly cloudy, with a high near 66. North wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Cloudy | 0 to 5 mph N | 3% |
| Tonight | 48°F | Slight Chance Rain Showers | 0 to 5 mph N | 20% |
| Sunday | 61°F | Partly Sunny | 5 mph NE | 2% |
| Sunday Night | 35°F | Mostly Cloudy | 0 mph | 0% |
| Monday | 60°F | Patchy Frost then Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 34°F | Mostly Clear then Patchy Frost | 0 mph | 0% |
| Tuesday | 61°F | Areas Of Frost then Sunny | 0 to 5 mph SE | 0% |
| Tuesday Night | 38°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 63°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 42°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Thursday | 64°F | Partly Sunny then Slight Chance Rain Showers | 0 to 5 mph S | 16% |
| Thursday Night | 46°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph S | 16% |
| Friday | 68°F | Partly Sunny | 0 to 5 mph S | 4% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph S | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mountain Iron, MN
Last spring frost
May 12
First fall frost
Oct 1
Growing season
141 days
Hardiness zone
3b
Explore more for Mountain Iron, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Eveleth Wwtp, Mn (15.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.