South Glastonbury, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Glastonbury, a community in Park County, Montana.
Tonight
44°F
Chance Rain Showers
A chance of rain showers and patchy fog. Cloudy, with a low around 44. Southeast wind 1 to 6 mph. Chance of precipitation is 50%.
7-day forecast for South Glastonbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Chance Rain Showers | 1 to 6 mph SE | 46% |
| Sunday | 64°F | Areas Of Fog then Partly Sunny | 1 to 9 mph ENE | 15% |
| Sunday Night | 42°F | Partly Cloudy | 6 mph S | 2% |
| Monday | 73°F | Sunny | 3 to 9 mph SSE | 4% |
| Monday Night | 45°F | Mostly Clear | 6 to 9 mph SSW | 0% |
| Tuesday | 77°F | Sunny | 5 to 12 mph S | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 6 to 9 mph SSW | 11% |
| Wednesday | 76°F | Mostly Sunny then Slight Chance Rain Showers | 8 to 13 mph SSW | 15% |
| Wednesday Night | 48°F | Mostly Clear | 8 to 16 mph SSW | 7% |
| Thursday | 79°F | Sunny | 14 to 20 mph SSW | 1% |
| Thursday Night | 50°F | Mostly Clear | 10 to 20 mph SSW | 1% |
| Friday | 79°F | Mostly Sunny | 17 mph SSW | 2% |
| Friday Night | 49°F | Partly Cloudy | 12 to 17 mph S | 8% |
| Saturday | 73°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 14 mph SSW | 24% |
Forecast source: National Weather Service (api.weather.gov) for South Glastonbury (45.312, -110.808). Updated through the day.
Growing snapshot for South Glastonbury
Last spring frost
May 21
First fall frost
Sep 27
Growing season
128 days
Hardiness zone
5a
More local growing data for South Glastonbury: nearby ZIP 59027 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Clyde Park
Cooke City
Corwin Springs
Emigrant
Gardiner
Jardine
Livingston
Pine Creek
Pray
Sedan
Silver Gate
Springdale
Wilsall
Wineglass
Climate data from the nearest NOAA station, Gardiner, Mt (18.5 mi from South Glastonbury). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.