Iron Junction, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iron Junction, a city in St. Louis County, Minnesota.
Overnight
46°F
Mostly Cloudy
Mostly cloudy. Low around 46, with temperatures rising to around 48 overnight. East wind around 0 mph.
7-day forecast for Iron Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Cloudy | 0 mph | 6% |
| Saturday | 67°F | Patchy Fog then Mostly Cloudy | 0 to 5 mph NE | 3% |
| Saturday Night | 47°F | Mostly Cloudy | 5 mph N | 2% |
| Sunday | 62°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 37°F | Mostly Cloudy then Patchy Frost | 0 to 5 mph E | 0% |
| Monday | 60°F | Patchy Frost then Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 36°F | Mostly Clear | 0 to 5 mph E | 0% |
| Tuesday | 63°F | Sunny | 0 to 5 mph SE | 0% |
| Tuesday Night | 36°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 64°F | Sunny | 0 to 10 mph SE | 0% |
| Wednesday Night | 39°F | Mostly Clear | 0 to 5 mph SE | 3% |
| Thursday | 66°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Thursday Night | 42°F | Partly Cloudy | 0 to 5 mph SE | 5% |
| Friday | 68°F | Partly Sunny | 0 to 5 mph S | 5% |
Forecast source: National Weather Service (api.weather.gov) for Iron Junction (47.419, -92.609). Updated through the day.
Growing snapshot for Iron Junction
Last spring frost
Jun 5
First fall frost
Sep 8
Growing season
93 days
Hardiness zone
3b
More local growing data for Iron Junction: nearby ZIP 55751 weather · frost dates · planting calendar · Minnesota frost dates
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Climate data from the nearest NOAA station, Hibbing Chisholm Hibbing Ap, Mn (7.8 mi from Iron Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.