Colstrip, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colstrip, a city in Rosebud County, Montana.
Tonight
31°F
Mostly Clear then Patchy Fog
Patchy fog between 2am and 5am. Mostly clear, with a low around 31. Southwest wind around 2 mph.
7-day forecast for Colstrip
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Mostly Clear then Patchy Fog | 2 mph SW | 0% |
| Wednesday | 51°F | Mostly Sunny | 0 to 6 mph NW | 0% |
| Wednesday Night | 31°F | Patchy Fog | 0 to 3 mph WSW | 0% |
| Thursday | 55°F | Sunny | 2 mph WNW | 0% |
| Thursday Night | 36°F | Partly Cloudy | 0 to 3 mph WNW | 1% |
| Friday | 55°F | Sunny | 2 to 6 mph WSW | 3% |
| Friday Night | 38°F | Partly Cloudy | 2 to 8 mph WSW | 7% |
| Saturday | 58°F | Sunny | 1 to 10 mph W | 2% |
| Saturday Night | 37°F | Mostly Clear | 1 to 5 mph SW | 0% |
| Sunday | 66°F | Mostly Sunny | 5 mph SW | 0% |
| Sunday Night | 41°F | Partly Cloudy | 5 mph W | 0% |
| Monday | 58°F | Mostly Sunny | 5 mph NW | 2% |
| Monday Night | 38°F | Partly Cloudy | 3 mph SSE | 2% |
| Tuesday | 61°F | Mostly Sunny | 2 to 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Colstrip (45.895, -106.628). Updated through the day.
Growing snapshot for Colstrip
Last spring frost
May 15
First fall frost
Sep 30
Growing season
138 days
Hardiness zone
5a
More local growing data for Colstrip: nearby ZIP 59323 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Colstrip, Mt (4.5 mi from Colstrip). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.