Plains, MT Weather & Growing Conditions
Overnight
51°F
Mostly Cloudy
Mostly cloudy, with a low around 51. West northwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 6 mph WNW | 2% |
| Saturday | 71°F | Mostly Sunny | 1 to 5 mph NNE | 4% |
| Saturday Night | 50°F | Mostly Clear | 5 mph SSW | 2% |
| Sunday | 73°F | Sunny | 3 mph SSW | 0% |
| Sunday Night | 50°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 76°F | Sunny | 5 mph SW | 0% |
| Monday Night | 52°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 75°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 5 mph WSW | 1% |
| Wednesday | 74°F | Mostly Sunny | 2 to 7 mph SW | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 5 to 9 mph WSW | 3% |
| Thursday | 72°F | Mostly Sunny | 5 mph WSW | 1% |
| Thursday Night | 51°F | Partly Cloudy | 2 to 6 mph WSW | 6% |
| Friday | 68°F | Mostly Sunny | 2 to 6 mph SW | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plains, MT
Growing season
101 days
Hardiness zone
6a
Explore more for Plains, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Saint Regis 1 Ne, Mt (20.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.