Heart Butte, MT Weather & Growing Conditions
Today
64°F
Mostly Sunny
Mostly sunny, with a high near 64. East northeast wind 2 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Mostly Sunny | 2 to 10 mph ENE | 1% |
| Tonight | 45°F | Mostly Clear | 5 to 10 mph S | 0% |
| Sunday | 71°F | Sunny | 7 mph S | 0% |
| Sunday Night | 47°F | Mostly Clear | 7 mph SW | 0% |
| Monday | 73°F | Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 50°F | Mostly Clear | 10 mph WSW | 0% |
| Tuesday | 71°F | Sunny | 8 mph WSW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 7 mph WSW | 0% |
| Wednesday | 72°F | Mostly Sunny | 6 to 10 mph SW | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 8 mph WSW | 2% |
| Thursday | 71°F | Mostly Sunny | 7 mph SW | 2% |
| Thursday Night | 50°F | Partly Cloudy | 6 mph SW | 7% |
| Friday | 65°F | Partly Sunny | 5 to 8 mph SW | 11% |
| Friday Night | 45°F | Chance Light Rain | 8 mph W | 32% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Heart Butte, MT
Last spring frost
Jun 8
First fall frost
Sep 5
Growing season
88 days
Hardiness zone
4b
Explore more for Heart Butte, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, E Glacier, Mt (21.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.