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.
Today
70°F
Mostly Sunny
Mostly sunny, with a high near 70. West wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Mountain Iron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Mostly Sunny | 10 mph W | 0% |
| Tonight | 47°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 74°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 0 to 5 mph SW | 10% |
| Thursday | 80°F | Sunny | 5 to 10 mph SW | 10% |
| Thursday Night | 58°F | Mostly Clear | 5 to 10 mph SW | 12% |
| Friday | 81°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 20% |
| Friday Night | 54°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 10 mph W | 26% |
| Saturday | 75°F | Chance Showers And Thunderstorms | 0 to 10 mph W | 25% |
| Saturday Night | 54°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 26% |
| Sunday | 74°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 21% |
| Sunday Night | 54°F | Partly Cloudy | 0 to 5 mph N | 12% |
| Monday | 77°F | Slight Chance Rain Showers | 0 to 5 mph NW | 15% |
| Monday Night | 53°F | Slight Chance Rain Showers | 0 to 5 mph N | 20% |
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 Aug 4, 2026.