Colstrip, MT Weather & Growing Conditions
Overnight
45°F
Mostly Clear
Mostly clear. Low around 45, with temperatures rising to around 47 overnight. South southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Mostly Clear | 2 mph SSW | 0% |
| Tuesday | 75°F | Sunny | 2 to 7 mph NW | 0% |
| Tuesday Night | 53°F | Mostly Clear | 3 to 7 mph ESE | 1% |
| Wednesday | 85°F | Sunny | 5 mph WSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 3 mph S | 0% |
| Thursday | 93°F | Sunny | 5 mph W | 0% |
| Thursday Night | 62°F | Mostly Clear | 5 mph NE | 0% |
| Friday | 97°F | Sunny | 5 mph SSW | 0% |
| Friday Night | 65°F | Partly Cloudy | 6 mph NNE | 0% |
| Saturday | 94°F | Sunny | 5 to 8 mph NW | 0% |
| Saturday Night | 66°F | Partly Cloudy | 6 mph ENE | 1% |
| Sunday | 93°F | Mostly Sunny | 3 to 8 mph NNE | 0% |
| Sunday Night | 66°F | Partly Cloudy | 7 mph NE | 8% |
| Monday | 90°F | Mostly Sunny | 5 to 8 mph ENE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Colstrip, MT
Last spring frost
May 15
First fall frost
Sep 30
Growing season
138 days
Hardiness zone
5a
Explore more for Colstrip, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Colstrip, Mt (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.