Colstrip, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colstrip, a city in Rosebud County, Montana.
Tonight
57°F
Chance Showers And Thunderstorms then Showers And Thunderstorms
A chance of showers and thunderstorms before 11pm, then showers and thunderstorms between 11pm and 3am, then patchy fog and showers and thunderstorms. Cloudy. Low around 57, with temperatures rising to around 59 overnight. Northwest wind around 5 mph. Chance of precipitation is 80%.
7-day forecast for Colstrip
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph NW | 83% |
| Saturday | 63°F | Patchy Fog | 3 to 8 mph NNE | 98% |
| Saturday Night | 54°F | Showers And Thunderstorms | 8 mph ENE | 95% |
| Sunday | 62°F | Rain Showers | 6 mph NNE | 83% |
| Sunday Night | 51°F | Chance Rain Showers then Mostly Cloudy | 3 mph E | 34% |
| Monday | 71°F | Partly Sunny | 5 mph SE | 1% |
| Monday Night | 50°F | Mostly Clear | 6 mph SE | 0% |
| Tuesday | 78°F | Sunny | 3 mph SSW | 0% |
| Tuesday Night | 54°F | Partly Cloudy | 2 mph ESE | 4% |
| Wednesday | 79°F | Mostly Sunny | 3 mph WSW | 3% |
| Wednesday Night | 54°F | Mostly Clear | 2 mph ESE | 3% |
| Thursday | 81°F | Sunny | 5 mph SSE | 1% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph SE | 1% |
| Friday | 81°F | Mostly Sunny | 3 mph SE | 5% |
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 Sep 19, 2026.