Jefferson City, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson City, a community in Jefferson County, Montana.
Today
74°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 74. Northeast wind 1 to 6 mph.
7-day forecast for Jefferson City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Patchy Smoke | 1 to 6 mph NE | 0% |
| Tonight | 49°F | Patchy Smoke then Mostly Clear | 1 to 5 mph W | 1% |
| Wednesday | 82°F | Sunny then Patchy Smoke | 2 to 7 mph W | 0% |
| Wednesday Night | 52°F | Patchy Smoke then Mostly Clear | 2 to 6 mph WNW | 0% |
| Thursday | 90°F | Sunny | 3 to 8 mph W | 0% |
| Thursday Night | 57°F | Mostly Clear | 2 to 8 mph W | 0% |
| Friday | 92°F | Sunny | 3 to 13 mph WSW | 0% |
| Friday Night | 57°F | Mostly Clear | 6 to 10 mph WNW | 0% |
| Saturday | 90°F | Sunny | 3 to 9 mph W | 0% |
| Saturday Night | 57°F | Mostly Clear | 2 to 8 mph WNW | 0% |
| Sunday | 87°F | Sunny | 6 mph NW | 1% |
| Sunday Night | 56°F | Mostly Clear | 2 to 7 mph NW | 1% |
| Monday | 85°F | Sunny | 2 to 6 mph N | 2% |
| Monday Night | 56°F | Partly Cloudy | 2 to 7 mph NNW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Jefferson City (46.378, -112.030). Updated through the day.
Growing snapshot for Jefferson City
Last spring frost
Jun 18
First fall frost
Sep 5
Growing season
81 days
Hardiness zone
4b
More local growing data for Jefferson City: nearby ZIP 59638 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Tizer Gardens, Mt (1.1 mi from Jefferson City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.