Joliet, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Joliet, a town in Carbon County, Montana.
Overnight
45°F
Mostly Clear
Mostly clear. Low around 45, with temperatures rising to around 47 overnight. Northwest wind around 3 mph.
7-day forecast for Joliet
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Mostly Clear | 3 mph NW | 0% |
| Tuesday | 77°F | Sunny then Patchy Smoke | 2 to 10 mph NNE | 0% |
| Tuesday Night | 48°F | Patchy Smoke | 3 to 10 mph N | 2% |
| Wednesday | 87°F | Sunny | 2 to 6 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph NW | 0% |
| Thursday | 95°F | Sunny | 6 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 6 to 9 mph NW | 0% |
| Friday | 99°F | Sunny | 5 mph SW | 0% |
| Friday Night | 59°F | Mostly Clear | 10 mph NW | 0% |
| Saturday | 96°F | Sunny | 5 to 9 mph NW | 0% |
| Saturday Night | 59°F | Partly Cloudy | 7 to 12 mph N | 0% |
| Sunday | 94°F | Sunny | 5 to 8 mph N | 2% |
| Sunday Night | 60°F | Partly Cloudy | 10 mph NNE | 7% |
| Monday | 91°F | Sunny | 6 to 9 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov) for Joliet (45.484, -108.972). Updated through the day.
Growing snapshot for Joliet
Last spring frost
May 29
First fall frost
Sep 15
Growing season
107 days
Hardiness zone
5a
More local growing data for Joliet: nearby ZIP 59041 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Joliet, Mt (2.8 mi from Joliet). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.