Grass Range, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grass Range, a town in Fergus County, Montana.
This Afternoon
56°F
Sunny
Sunny. High near 56, with temperatures falling to around 47 in the afternoon. South wind around 5 mph.
7-day forecast for Grass Range
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 5 mph S | 0% |
| Tonight | 33°F | Partly Cloudy | 3 to 8 mph SW | 0% |
| Wednesday | 52°F | Mostly Sunny | 5 mph NW | 0% |
| Wednesday Night | 31°F | Partly Cloudy | 2 to 6 mph WSW | 0% |
| Thursday | 57°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Thursday Night | 35°F | Partly Cloudy | 0 to 10 mph W | 1% |
| Friday | 57°F | Sunny | 6 to 9 mph WSW | 3% |
| Friday Night | 38°F | Partly Cloudy | 7 to 16 mph WSW | 7% |
| Saturday | 55°F | Sunny | 3 to 21 mph W | 1% |
| Saturday Night | 36°F | Partly Cloudy | 3 to 9 mph WSW | 0% |
| Sunday | 65°F | Mostly Sunny | 7 mph WSW | 1% |
| Sunday Night | 41°F | Partly Cloudy | 6 to 9 mph W | 1% |
| Monday | 57°F | Partly Sunny | 7 mph WSW | 0% |
| Monday Night | 39°F | Mostly Cloudy | 8 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grass Range (47.026, -108.803). Updated through the day.
Growing snapshot for Grass Range
Last spring frost
May 20
First fall frost
Sep 24
Growing season
126 days
Hardiness zone
4b
More local growing data for Grass Range: nearby ZIP 59032 weather · frost dates · planting calendar · Montana frost dates
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Lewistown Heights
Moore
Roy
Warm Spring Creek
Winifred
Climate data from the nearest NOAA station, Grass Range, Mt (4.7 mi from Grass Range). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.