Bynum, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bynum, a community in Teton County, Montana.
This Afternoon
53°F
Partly Sunny
Partly sunny. High near 53, with temperatures falling to around 46 in the afternoon. Northeast wind around 1 mph.
7-day forecast for Bynum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 53°F | Partly Sunny | 1 mph NE | 0% |
| Tonight | 31°F | Mostly Cloudy | 0 to 3 mph WNW | 0% |
| Wednesday | 49°F | Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 30°F | Mostly Clear | 2 mph SW | 0% |
| Thursday | 52°F | Mostly Sunny | 2 to 7 mph WSW | 0% |
| Thursday Night | 32°F | Partly Cloudy | 7 mph WSW | 1% |
| Friday | 51°F | Mostly Sunny | 6 to 10 mph SW | 4% |
| Friday Night | 36°F | Mostly Cloudy | 8 to 15 mph WSW | 4% |
| Saturday | 53°F | Mostly Sunny | 3 to 8 mph WSW | 0% |
| Saturday Night | 36°F | Mostly Cloudy | 6 mph SW | 1% |
| Sunday | 61°F | Partly Sunny | 6 to 13 mph SW | 3% |
| Sunday Night | 36°F | Mostly Cloudy | 3 to 8 mph WSW | 3% |
| Monday | 53°F | Partly Sunny | 5 mph SW | 2% |
| Monday Night | 35°F | Mostly Cloudy | 5 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Bynum (47.968, -112.316). Updated through the day.
Growing snapshot for Bynum
Last spring frost
May 16
First fall frost
Sep 27
Growing season
133 days
Hardiness zone
4b
More local growing data for Bynum: nearby ZIP 59419 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Augusta
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Dutton
Gilman
Miller Colony
New Miami Colony
New Rockport Colony
Pendroy
Power
Rockport Colony
Climate data from the nearest NOAA station, Bynum 4 Sse, Mt (3 mi from Bynum). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.