South Glastonbury, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Glastonbury, a community in Park County, Montana.
Overnight
28°F
Mostly Cloudy
Mostly cloudy. Low around 28, with temperatures rising to around 30 overnight. West wind around 3 mph.
7-day forecast for South Glastonbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Mostly Cloudy | 3 mph W | 0% |
| Wednesday | 53°F | Mostly Sunny | 2 to 7 mph NNW | 0% |
| Wednesday Night | 29°F | Mostly Clear | 3 to 17 mph SW | 0% |
| Thursday | 52°F | Partly Sunny then Slight Chance Rain Showers | 9 to 20 mph SSW | 24% |
| Thursday Night | 29°F | Slight Chance Rain And Snow Showers | 6 to 9 mph SSW | 24% |
| Friday | 51°F | Sunny | 8 to 17 mph SSW | 0% |
| Friday Night | 29°F | Partly Cloudy | 13 to 22 mph SSW | 0% |
| Saturday | 57°F | Sunny | 8 to 16 mph SSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 9 to 23 mph SSW | 0% |
| Sunday | 60°F | Mostly Sunny | 18 to 28 mph S | 1% |
| Sunday Night | 34°F | Partly Cloudy | 12 to 23 mph SSW | 2% |
| Monday | 60°F | Mostly Sunny | 10 to 14 mph SSW | 2% |
| Monday Night | 35°F | Partly Cloudy | 10 to 14 mph SSW | 2% |
| Tuesday | 58°F | Mostly Sunny | 10 to 14 mph SSW | 4% |
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 Nov 4, 2026.