Knife River, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knife River, a community in Lake County, Minnesota.
Tonight
53°F
Mostly Cloudy then Patchy Fog
Patchy fog after 4am. Mostly cloudy, with a low around 53. Northeast wind 5 to 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Knife River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Mostly Cloudy then Patchy Fog | 5 to 10 mph NE | 9% |
| Saturday | 63°F | Patchy Fog then Partly Sunny | 5 to 10 mph NE | 7% |
| Saturday Night | 53°F | Mostly Cloudy | 0 to 5 mph NE | 0% |
| Sunday | 59°F | Partly Sunny | 5 to 15 mph NE | 0% |
| Sunday Night | 49°F | Mostly Cloudy | 5 to 10 mph E | 0% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 46°F | Partly Cloudy | 5 to 15 mph E | 0% |
| Tuesday | 60°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 46°F | Mostly Clear | 0 to 10 mph E | 0% |
| Wednesday | 63°F | Sunny | 0 to 10 mph E | 1% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 10 mph NE | 4% |
| Thursday | 66°F | Mostly Sunny | 0 to 5 mph SE | 9% |
| Thursday Night | 50°F | Partly Cloudy | 0 mph | 6% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Knife River (46.949, -91.784). Updated through the day.
Growing snapshot for Knife River
Last spring frost
May 12
First fall frost
Oct 6
Growing season
145 days
Hardiness zone
4b
More local growing data for Knife River: nearby ZIP 55609 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Two Harbors, Mn (7.1 mi from Knife River). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.