Iron River, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iron River, a city in Iron County, Michigan.
Overnight
42°F
Mostly Cloudy
Mostly cloudy, with a low around 42. Southeast wind around 5 mph.
7-day forecast for Iron River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Cloudy | 5 mph SE | 10% |
| Saturday | 61°F | Chance Rain Showers | 5 to 10 mph SE | 36% |
| Saturday Night | 41°F | Slight Chance Rain Showers then Patchy Fog | 0 to 5 mph NE | 21% |
| Sunday | 62°F | Patchy Fog then Partly Sunny | 5 to 10 mph NE | 5% |
| Sunday Night | 34°F | Mostly Cloudy | 0 to 10 mph NE | 0% |
| Monday | 61°F | Partly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 31°F | Partly Cloudy | 0 to 5 mph NE | 0% |
| Tuesday | 64°F | Sunny | 0 to 5 mph E | 0% |
| Tuesday Night | 33°F | Mostly Clear | 0 to 5 mph E | 0% |
| Wednesday | 66°F | Sunny | 0 to 5 mph E | 0% |
| Wednesday Night | 36°F | Mostly Clear | 0 to 5 mph NE | 1% |
| Thursday | 68°F | Sunny | 0 to 5 mph E | 2% |
| Thursday Night | 37°F | Mostly Clear | 0 mph | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph SE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Iron River (46.096, -88.637). Updated through the day.
Growing snapshot for Iron River
Last spring frost
Jun 4
First fall frost
Sep 10
Growing season
95 days
Hardiness zone
4a
More local growing data for Iron River: nearby ZIP 49915 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Stambaugh 2Sse, Mi (0.6 mi from Iron River). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.