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
55°F
Mostly Cloudy
Mostly cloudy, with a low around 55. Northwest wind around 5 mph, with gusts as high as 20 mph. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Iron Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Mostly Cloudy | 5 mph NW | 12% |
| Tuesday | 71°F | Mostly Sunny | 5 to 10 mph W | 5% |
| Tuesday Night | 46°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 75°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 0 to 5 mph SW | 11% |
| Thursday | 81°F | Sunny | 5 to 10 mph SW | 11% |
| Thursday Night | 58°F | Mostly Clear | 5 to 10 mph SW | 11% |
| Friday | 82°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 18% |
| Friday Night | 54°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 10 mph NW | 27% |
| Saturday | 76°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 25% |
| Saturday Night | 54°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 26% |
| Sunday | 75°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 21% |
| Sunday Night | 54°F | Partly Cloudy | 0 to 5 mph N | 13% |
| Monday | 77°F | Slight Chance Rain Showers | 0 to 5 mph NW | 15% |
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 Aug 4, 2026.