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.
This Afternoon
55°F
Chance Rain
Patchy fog and a slight chance of rain before 4pm, then a chance of rain and patchy fog. Cloudy. High near 55, with temperatures falling to around 53 in the afternoon. North wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mountain Iron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Chance Rain | 10 mph N | 54% |
| Tonight | 47°F | Rain | 10 mph N | 87% |
| Wednesday | 49°F | Rain | 10 to 15 mph N | 88% |
| Wednesday Night | 36°F | Light Rain | 10 to 15 mph N | 89% |
| Thursday | 41°F | Mostly Cloudy | 10 to 15 mph N | 7% |
| Thursday Night | 24°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Friday | 41°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 24°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 47°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Saturday Night | 31°F | Partly Cloudy | 5 mph W | 14% |
| Sunday | 49°F | Mostly Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 31°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Monday | 52°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 32°F | Partly Cloudy | 5 to 10 mph W | 0% |
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 Nov 4, 2026.