Thief River Falls, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thief River Falls, a city in Pennington County, Minnesota.
This Afternoon
47°F
Cloudy
Cloudy. High near 47, with temperatures falling to around 44 in the afternoon. North wind around 16 mph, with gusts as high as 26 mph.
7-day forecast for Thief River Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Cloudy | 16 mph N | 11% |
| Tonight | 39°F | Cloudy | 13 to 16 mph N | 11% |
| Wednesday | 48°F | Cloudy | 18 mph N | 9% |
| Wednesday Night | 32°F | Mostly Cloudy | 14 to 17 mph N | 0% |
| Thursday | 40°F | Partly Sunny | 8 to 15 mph NNE | 0% |
| Thursday Night | 25°F | Partly Cloudy | 6 mph ESE | 0% |
| Friday | 42°F | Mostly Sunny | 3 to 10 mph S | 0% |
| Friday Night | 29°F | Partly Cloudy | 7 to 10 mph SSW | 0% |
| Saturday | 51°F | Mostly Sunny | 10 to 15 mph SW | 8% |
| Saturday Night | 33°F | Slight Chance Light Rain then Partly Cloudy | 7 to 12 mph W | 15% |
| Sunday | 51°F | Mostly Sunny | 7 to 12 mph WSW | 3% |
| Sunday Night | 36°F | Mostly Cloudy | 8 to 13 mph SSW | 0% |
| Monday | 53°F | Mostly Sunny | 13 to 20 mph WSW | 1% |
| Monday Night | 33°F | Mostly Clear | 7 to 13 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Thief River Falls (48.111, -96.178). Updated through the day.
Growing snapshot for Thief River Falls
Last spring frost
May 14
First fall frost
Sep 28
Growing season
135 days
Hardiness zone
4a
More local growing data for Thief River Falls: nearby ZIP 56701 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Thief Rvr Falls 2, Mn (1.2 mi from Thief River Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.