Pioneer Junction, MT Weather & Growing Conditions
This Afternoon
82°F
Mostly Sunny
Mostly sunny, with a high near 82. West northwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Mostly Sunny | 3 mph WNW | 0% |
| Tonight | 49°F | Partly Cloudy | 1 mph NNW | 1% |
| Saturday | 83°F | Sunny | 1 mph NNW | 2% |
| Saturday Night | 48°F | Partly Cloudy | 0 mph | 1% |
| Sunday | 83°F | Sunny | 2 mph W | 0% |
| Sunday Night | 50°F | Mostly Clear | 0 mph | 0% |
| Monday | 84°F | Sunny | 2 mph S | 0% |
| Monday Night | 50°F | Mostly Clear | 1 mph SW | 0% |
| Tuesday | 82°F | Sunny | 2 mph S | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 1 mph SSW | 1% |
| Wednesday | 78°F | Sunny | 1 to 5 mph SSW | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 2 mph SW | 1% |
| Thursday | 81°F | Mostly Sunny | 1 mph WNW | 2% |
| Thursday Night | 50°F | Partly Cloudy | 1 mph SE | 3% |
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 Sep 19, 2026.