Grass Range, MT Weather & Growing Conditions
This Afternoon
55°F
Sunny
Sunny. High near 55, with temperatures falling to around 46 in the afternoon. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Sunny | 5 mph S | 0% |
| Tonight | 33°F | Partly Cloudy | 5 to 8 mph SW | 0% |
| Wednesday | 50°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Wednesday Night | 31°F | Partly Cloudy | 1 to 6 mph WSW | 0% |
| Thursday | 55°F | Mostly Sunny | 0 to 6 mph W | 0% |
| Thursday Night | 36°F | Partly Cloudy | 0 to 10 mph W | 1% |
| Friday | 56°F | Sunny | 8 mph WSW | 3% |
| Friday Night | 39°F | Partly Cloudy | 6 to 16 mph WSW | 6% |
| Saturday | 54°F | Sunny | 3 to 20 mph W | 1% |
| Saturday Night | 37°F | Partly Cloudy | 3 to 8 mph SW | 0% |
| Sunday | 64°F | Mostly Sunny | 7 mph WSW | 1% |
| Sunday Night | 41°F | Partly Cloudy | 6 to 9 mph W | 1% |
| Monday | 55°F | Partly Sunny | 6 mph W | 0% |
| Monday Night | 40°F | Mostly Cloudy | 5 to 8 mph SSW | 1% |
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 Nov 4, 2026.