Bynum, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bynum, a community in Teton County, Montana.
This Afternoon
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 43 in the afternoon. East wind around 2 mph.
7-day forecast for Bynum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 2 mph E | 0% |
| Tonight | 30°F | Mostly Clear | 3 mph WSW | 0% |
| Thursday | 51°F | Mostly Sunny | 3 to 8 mph SW | 2% |
| Thursday Night | 31°F | Mostly Clear | 7 mph SW | 0% |
| Friday | 53°F | Mostly Sunny | 6 to 9 mph SW | 1% |
| Friday Night | 38°F | Mostly Cloudy | 5 to 12 mph SW | 1% |
| Saturday | 59°F | Partly Sunny | 6 mph SW | 0% |
| Saturday Night | 38°F | Mostly Cloudy | 7 mph SSW | 0% |
| Sunday | 61°F | Partly Sunny | 6 to 14 mph SW | 0% |
| Sunday Night | 35°F | Mostly Cloudy | 2 to 6 mph WSW | 0% |
| Monday | 52°F | Partly Sunny | 5 mph SW | 0% |
| Monday Night | 35°F | Mostly Cloudy | 5 mph SSW | 0% |
| Tuesday | 57°F | Mostly Sunny | 5 to 8 mph SW | 3% |
| Tuesday Night | 38°F | Partly Cloudy | 8 mph SW | 3% |
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
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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.