Greycliff, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greycliff, a community in Sweet Grass County, Montana.
This Afternoon
54°F
Sunny
Sunny. High near 54, with temperatures falling to around 48 in the afternoon. South southeast wind around 5 mph.
7-day forecast for Greycliff
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Sunny | 5 mph SSE | 0% |
| Tonight | 29°F | Mostly Clear | 5 mph WSW | 0% |
| Wednesday | 55°F | Mostly Sunny | 5 mph NW | 0% |
| Wednesday Night | 29°F | Patchy Fog | 3 mph S | 0% |
| Thursday | 58°F | Mostly Sunny | 3 to 9 mph WSW | 3% |
| Thursday Night | 32°F | Partly Cloudy | 5 to 13 mph W | 3% |
| Friday | 58°F | Sunny | 9 to 15 mph WSW | 4% |
| Friday Night | 36°F | Partly Cloudy | 9 to 17 mph WSW | 4% |
| Saturday | 61°F | Sunny | 5 to 16 mph WSW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 7 mph SW | 0% |
| Sunday | 67°F | Mostly Sunny | 7 mph WSW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 3 to 10 mph WSW | 0% |
| Monday | 60°F | Mostly Sunny | 3 mph SSW | 1% |
| Monday Night | 36°F | Partly Cloudy | 5 mph SSW | 1% |
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 Nov 4, 2026.