Greycliff, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greycliff, a community in Sweet Grass County, Montana.
Overnight
52°F
Patchy Fog
Patchy fog and showers and thunderstorms before 3am, then patchy fog and showers and thunderstorms. Cloudy. Low around 52, with temperatures rising to around 55 overnight. Northwest wind around 3 mph. Chance of precipitation is 100%.
7-day forecast for Greycliff
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Patchy Fog | 3 mph NW | 98% |
| Saturday | 59°F | Patchy Fog | 3 to 9 mph NW | 95% |
| Saturday Night | 46°F | Rain Showers | 3 to 7 mph WNW | 91% |
| Sunday | 66°F | Rain Showers Likely | 5 mph NW | 62% |
| Sunday Night | 44°F | Partly Cloudy then Patchy Fog | 3 mph SSE | 4% |
| Monday | 74°F | Patchy Fog then Sunny | 1 to 5 mph S | 1% |
| Monday Night | 46°F | Mostly Clear | 2 to 8 mph SSW | 0% |
| Tuesday | 79°F | Sunny | 2 mph SW | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 1 to 5 mph S | 2% |
| Wednesday | 80°F | Sunny | 5 mph WSW | 5% |
| Wednesday Night | 49°F | Mostly Clear | 5 mph SSW | 5% |
| Thursday | 81°F | Sunny | 2 to 6 mph SSW | 1% |
| Thursday Night | 49°F | Mostly Clear | 2 to 8 mph SSW | 1% |
| Friday | 81°F | Mostly Sunny | 2 to 6 mph SW | 5% |
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 Sep 19, 2026.