Grass Range, MT Weather & Growing Conditions
This Afternoon
76°F
Partly Sunny
Partly sunny, with a high near 76. North northeast wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Partly Sunny | 10 mph NNE | 3% |
| Tonight | 54°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 to 12 mph N | 64% |
| Saturday | 59°F | Rain then Showers And Thunderstorms | 13 mph N | 84% |
| Saturday Night | 52°F | Rain | 9 mph N | 81% |
| Sunday | 62°F | Light Rain Likely | 8 mph NE | 69% |
| Sunday Night | 49°F | Mostly Cloudy | 7 mph SE | 9% |
| Monday | 73°F | Mostly Sunny | 6 to 13 mph SSE | 0% |
| Monday Night | 51°F | Mostly Clear | 8 to 12 mph S | 0% |
| Tuesday | 78°F | Mostly Sunny | 6 mph W | 0% |
| Tuesday Night | 54°F | Partly Cloudy | 7 mph S | 2% |
| Wednesday | 78°F | Sunny | 7 mph SW | 3% |
| Wednesday Night | 54°F | Mostly Clear | 8 mph S | 1% |
| Thursday | 79°F | Sunny | 6 to 10 mph S | 3% |
| Thursday Night | 55°F | Partly Cloudy | 9 mph S | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grass Range, MT
Last spring frost
May 20
First fall frost
Sep 24
Growing season
126 days
Hardiness zone
4b
Explore more for Grass Range, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Grass Range, Mt (4.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.