Mountain Iron, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mountain Iron, a city in St. Louis County, Minnesota.
Overnight
46°F
Patchy Fog
Patchy fog after 3am. Mostly cloudy, with a low around 46. East wind around 0 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mountain Iron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Patchy Fog | 0 mph | 4% |
| Saturday | 68°F | Patchy Fog then Partly Sunny | 0 to 5 mph NE | 2% |
| Saturday Night | 47°F | Mostly Cloudy | 5 mph N | 2% |
| Sunday | 62°F | Partly Sunny | 5 mph NE | 0% |
| Sunday Night | 39°F | Mostly Cloudy | 0 to 5 mph E | 0% |
| Monday | 60°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 36°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Tuesday | 62°F | Sunny | 0 to 5 mph SE | 0% |
| Tuesday Night | 37°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 63°F | Mostly Sunny | 0 to 5 mph SE | 1% |
| Wednesday Night | 42°F | Partly Cloudy | 0 to 5 mph SE | 6% |
| Thursday | 65°F | Partly Sunny | 0 to 5 mph S | 6% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 5 mph SW | 6% |
| Friday | 68°F | Mostly Sunny | 0 to 5 mph S | 4% |
Forecast source: National Weather Service (api.weather.gov) for Mountain Iron (47.537, -92.617). Updated through the day.
Growing snapshot for Mountain Iron
Last spring frost
May 12
First fall frost
Oct 1
Growing season
141 days
Hardiness zone
3b
More local growing data for Mountain Iron: nearby ZIP 55768 weather · frost dates · planting calendar · Minnesota frost dates
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Climate data from the nearest NOAA station, Eveleth Wwtp, Mn (8.2 mi from Mountain Iron). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.