Bynum, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bynum, a community in Teton County, Montana.
Overnight
42°F
Mostly Clear
Mostly clear. Low around 42, with temperatures rising to around 45 overnight. West wind around 3 mph.
7-day forecast for Bynum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 3 mph W | 0% |
| Tuesday | 76°F | Mostly Sunny | 1 to 6 mph SSE | 1% |
| Tuesday Night | 48°F | Mostly Clear | 6 mph W | 1% |
| Wednesday | 84°F | Sunny | 7 mph WNW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph W | 0% |
| Thursday | 90°F | Sunny | 5 to 9 mph WNW | 0% |
| Thursday Night | 54°F | Mostly Clear | 2 to 10 mph WNW | 0% |
| Friday | 93°F | Sunny | 2 to 17 mph WNW | 0% |
| Friday Night | 56°F | Mostly Clear | 8 to 15 mph W | 0% |
| Saturday | 90°F | Sunny | 5 to 10 mph W | 0% |
| Saturday Night | 55°F | Partly Cloudy | 6 to 12 mph WNW | 0% |
| Sunday | 85°F | Sunny | 8 mph N | 1% |
| Sunday Night | 54°F | Partly Cloudy | 5 to 9 mph N | 6% |
| Monday | 83°F | Sunny | 7 mph NNE | 9% |
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
Choteau
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 Aug 4, 2026.