Sweet Grass, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sweet Grass, a community in Toole County, Montana.
Today
75°F
Sunny
Sunny, with a high near 75. West southwest wind around 6 mph.
7-day forecast for Sweet Grass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 6 mph WSW | 1% |
| Tonight | 50°F | Mostly Clear | 3 to 12 mph SW | 0% |
| Wednesday | 80°F | Mostly Sunny | 9 mph WNW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 to 10 mph SSW | 0% |
| Thursday | 85°F | Sunny | 9 to 13 mph NNW | 0% |
| Thursday Night | 53°F | Mostly Clear | 5 to 12 mph NE | 0% |
| Friday | 90°F | Sunny | 3 to 18 mph WNW | 0% |
| Friday Night | 54°F | Mostly Clear | 15 mph NNW | 1% |
| Saturday | 86°F | Sunny | 10 mph NW | 1% |
| Saturday Night | 54°F | Partly Cloudy | 12 mph N | 2% |
| Sunday | 80°F | Mostly Sunny | 12 mph N | 1% |
| Sunday Night | 53°F | Partly Cloudy then Slight Chance Rain Showers | 8 to 12 mph NNE | 16% |
| Monday | 79°F | Mostly Sunny | 9 mph NNE | 13% |
| Monday Night | 52°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph NE | 23% |
Forecast source: National Weather Service (api.weather.gov) for Sweet Grass (48.993, -111.967). Updated through the day.
Growing snapshot for Sweet Grass
Last spring frost
May 17
First fall frost
Sep 25
Growing season
129 days
Hardiness zone
4a
More local growing data for Sweet Grass: nearby ZIP 59482 weather · frost dates · planting calendar · Montana frost dates
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Sunburst
Climate data from the nearest NOAA station, Sunburst 8 E, Mt (5.9 mi from Sweet Grass). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.