Joliet, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Joliet, a town in Carbon County, Montana.
Tonight
52°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 52, with temperatures rising to around 55 overnight. North northwest wind around 9 mph. Chance of precipitation is 90%.
7-day forecast for Joliet
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Showers And Thunderstorms | 9 mph NNW | 87% |
| Saturday | 59°F | Showers And Thunderstorms | 9 to 15 mph NNW | 98% |
| Saturday Night | 48°F | Showers And Thunderstorms | 10 to 14 mph NW | 89% |
| Sunday | 63°F | Rain Showers Likely | 8 mph NW | 67% |
| Sunday Night | 46°F | Mostly Cloudy | 2 to 6 mph ENE | 10% |
| Monday | 72°F | Sunny | 3 to 10 mph S | 0% |
| Monday Night | 47°F | Mostly Clear | 7 mph S | 0% |
| Tuesday | 77°F | Sunny | 6 mph SSW | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 5 mph SSW | 4% |
| Wednesday | 77°F | Sunny | 6 mph SSW | 5% |
| Wednesday Night | 50°F | Mostly Clear | 3 to 8 mph S | 2% |
| Thursday | 78°F | Sunny | 8 to 13 mph S | 1% |
| Thursday Night | 50°F | Mostly Clear | 6 to 9 mph SSE | 1% |
| Friday | 79°F | Mostly Sunny | 10 to 14 mph SSW | 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 Sep 19, 2026.