Grass Range, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grass Range, a town in Fergus County, Montana.
Today
75°F
Sunny
Sunny, with a high near 75. Northwest wind 3 to 7 mph.
7-day forecast for Grass Range
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 3 to 7 mph NW | 0% |
| Tonight | 51°F | Mostly Clear | 5 to 8 mph SE | 2% |
| Wednesday | 84°F | Sunny | 5 to 12 mph W | 0% |
| Wednesday Night | 55°F | Mostly Clear | 5 to 10 mph WNW | 0% |
| Thursday | 91°F | Sunny | 6 to 13 mph WNW | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 to 14 mph W | 0% |
| Friday | 94°F | Sunny | 3 to 15 mph SE | 1% |
| Friday Night | 62°F | Mostly Clear | 8 to 14 mph NW | 1% |
| Saturday | 92°F | Sunny | 16 mph WNW | 0% |
| Saturday Night | 62°F | Mostly Clear | 6 to 13 mph NNW | 2% |
| Sunday | 89°F | Sunny | 7 to 14 mph NNW | 1% |
| Sunday Night | 60°F | Partly Cloudy | 3 to 13 mph NNE | 7% |
| Monday | 86°F | Mostly Sunny | 5 to 12 mph N | 12% |
| Monday Night | 59°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 13 mph E | 23% |
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
Nearby towns & communities
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Deerfield Colony
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King Ranch Colony
Lewistown
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 Aug 4, 2026.