South Glastonbury, MT Weather & Growing Conditions
Overnight
29°F
Mostly Cloudy
Mostly cloudy. Low around 29, with temperatures rising to around 31 overnight. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Mostly Cloudy | 6 mph SW | 0% |
| Wednesday | 50°F | Mostly Sunny | 2 to 7 mph NE | 0% |
| Wednesday Night | 30°F | Mostly Clear | 3 to 18 mph SW | 0% |
| Thursday | 47°F | Partly Sunny then Slight Chance Rain Showers | 9 to 18 mph SSW | 21% |
| Thursday Night | 30°F | Slight Chance Rain And Snow Showers | 7 to 12 mph SSW | 24% |
| Friday | 47°F | Sunny | 12 to 15 mph SSW | 0% |
| Friday Night | 30°F | Partly Cloudy | 12 to 20 mph SSW | 0% |
| Saturday | 53°F | Sunny | 7 to 16 mph S | 0% |
| Saturday Night | 35°F | Mostly Clear | 9 to 28 mph SSW | 0% |
| Sunday | 55°F | Mostly Sunny | 14 to 28 mph S | 1% |
| Sunday Night | 35°F | Partly Cloudy | 14 to 20 mph SSW | 1% |
| Monday | 55°F | Mostly Sunny | 9 to 14 mph SSW | 2% |
| Monday Night | 37°F | Partly Cloudy | 9 to 15 mph SSW | 2% |
| Tuesday | 54°F | Mostly Sunny | 9 to 15 mph SSW | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Glastonbury, MT
Last spring frost
May 21
First fall frost
Sep 27
Growing season
128 days
Hardiness zone
5a
Explore more for South Glastonbury, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Gardiner, Mt (18.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.