Grass Range, MT Weather & Growing Conditions
Today
75°F
Sunny
Sunny, with a high near 75. Northwest wind 3 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 3 to 8 mph NW | 0% |
| Tonight | 52°F | Partly Cloudy | 5 to 9 mph E | 2% |
| Wednesday | 84°F | Sunny | 5 to 10 mph WNW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 6 to 12 mph WNW | 0% |
| Thursday | 90°F | Sunny | 7 to 13 mph WNW | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 to 14 mph NW | 0% |
| Friday | 94°F | Sunny | 5 to 15 mph ESE | 1% |
| Friday Night | 63°F | Mostly Clear | 7 to 14 mph NW | 1% |
| Saturday | 91°F | Sunny | 16 mph NW | 0% |
| Saturday Night | 62°F | Mostly Clear | 6 to 13 mph NNE | 2% |
| Sunday | 89°F | Mostly Sunny | 7 to 14 mph NNW | 1% |
| Sunday Night | 61°F | Partly Cloudy | 5 to 13 mph NNE | 7% |
| Monday | 85°F | Sunny | 6 to 12 mph N | 11% |
| Monday Night | 60°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 13 mph E | 23% |
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 Aug 4, 2026.