Jefferson City, MT Weather & Growing Conditions
Overnight
42°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 42. West southwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Patchy Smoke | 1 mph WSW | 0% |
| Tuesday | 70°F | Patchy Smoke | 1 to 6 mph NE | 0% |
| Tuesday Night | 48°F | Patchy Smoke then Mostly Clear | 5 mph SSW | 1% |
| Wednesday | 78°F | Sunny then Patchy Smoke | 3 to 7 mph W | 0% |
| Wednesday Night | 52°F | Patchy Smoke then Mostly Clear | 2 to 7 mph WNW | 0% |
| Thursday | 86°F | Sunny | 5 to 8 mph W | 0% |
| Thursday Night | 57°F | Mostly Clear | 2 to 8 mph W | 0% |
| Friday | 89°F | Sunny | 5 to 13 mph WSW | 0% |
| Friday Night | 58°F | Mostly Clear | 6 to 12 mph WNW | 0% |
| Saturday | 87°F | Sunny | 5 to 9 mph W | 0% |
| Saturday Night | 58°F | Mostly Clear | 3 to 9 mph WNW | 0% |
| Sunday | 84°F | Sunny | 7 mph NW | 1% |
| Sunday Night | 57°F | Mostly Clear | 3 to 8 mph NW | 1% |
| Monday | 82°F | Sunny | 6 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Jefferson City, MT
Last spring frost
Jun 18
First fall frost
Sep 5
Growing season
81 days
Hardiness zone
4b
Explore more for Jefferson City, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Tizer Gardens, Mt (1.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.