Pioneer Junction, MT Weather & Growing Conditions
Today
87°F
Sunny
Sunny, with a high near 87. North wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 0 to 3 mph N | 0% |
| Tonight | 50°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Wednesday | 93°F | Sunny then Patchy Smoke | 0 to 3 mph WSW | 0% |
| Wednesday Night | 54°F | Patchy Smoke then Clear | 3 mph SW | 0% |
| Thursday | 99°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 57°F | Mostly Clear | 0 to 5 mph W | 0% |
| Friday | 99°F | Sunny | 0 to 7 mph SSW | 0% |
| Friday Night | 57°F | Mostly Clear | 2 to 8 mph SSW | 0% |
| Saturday | 96°F | Sunny | 1 to 8 mph SSW | 0% |
| Saturday Night | 56°F | Mostly Clear | 1 to 6 mph SSW | 0% |
| Sunday | 94°F | Sunny | 1 to 5 mph SSW | 0% |
| Sunday Night | 54°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Monday | 93°F | Sunny | 0 to 3 mph WSW | 0% |
| Monday Night | 54°F | Mostly Clear | 0 to 3 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Pioneer Junction, MT
Last spring frost
May 11
First fall frost
Oct 1
Growing season
142 days
Hardiness zone
6a
Explore more for Pioneer Junction, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Libby Dam (Base), Mt (9.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.