Greycliff, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greycliff, a community in Sweet Grass County, Montana.
Overnight
44°F
Mostly Clear
Mostly clear, with a low around 44. East southeast wind around 1 mph.
7-day forecast for Greycliff
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Mostly Clear | 1 mph ESE | 0% |
| Tuesday | 77°F | Sunny then Patchy Smoke | 0 to 8 mph ENE | 0% |
| Tuesday Night | 49°F | Patchy Smoke then Mostly Clear | 1 to 8 mph ESE | 1% |
| Wednesday | 88°F | Sunny | 2 to 13 mph WNW | 0% |
| Wednesday Night | 53°F | Mostly Clear | 2 to 12 mph WNW | 0% |
| Thursday | 95°F | Sunny | 2 to 18 mph W | 0% |
| Thursday Night | 58°F | Mostly Clear | 1 to 17 mph WNW | 0% |
| Friday | 101°F | Sunny | 2 to 16 mph W | 0% |
| Friday Night | 61°F | Mostly Clear | 6 to 21 mph WNW | 0% |
| Saturday | 98°F | Sunny | 7 to 20 mph W | 0% |
| Saturday Night | 60°F | Partly Cloudy | 2 to 18 mph NNW | 3% |
| Sunday | 95°F | Sunny | 3 to 9 mph N | 2% |
| Sunday Night | 59°F | Partly Cloudy | 3 to 14 mph N | 12% |
| Monday | 92°F | Sunny | 2 to 10 mph N | 6% |
Forecast source: National Weather Service (api.weather.gov) for Greycliff (45.759, -109.780). Updated through the day.
Growing snapshot for Greycliff
Last spring frost
May 14
First fall frost
Sep 26
Growing season
133 days
Hardiness zone
5a
More local growing data for Greycliff: nearby ZIP 59033 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Big Timber, Mt (12.8 mi from Greycliff). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.