Heart Butte, MT Weather & Growing Conditions
Tonight
31°F
Mostly Cloudy
Mostly cloudy, with a low around 31. West southwest wind 5 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Mostly Cloudy | 5 to 9 mph WSW | 0% |
| Wednesday | 49°F | Mostly Sunny | 5 mph WNW | 0% |
| Wednesday Night | 33°F | Mostly Clear | 3 to 12 mph SW | 0% |
| Thursday | 46°F | Mostly Sunny | 12 to 21 mph WSW | 1% |
| Thursday Night | 35°F | Partly Cloudy | 20 to 28 mph WSW | 1% |
| Friday | 45°F | Mostly Sunny then Slight Chance Light Rain | 24 to 31 mph WSW | 16% |
| Friday Night | 36°F | Slight Chance Light Rain then Mostly Cloudy | 22 to 33 mph WSW | 16% |
| Saturday | 48°F | Partly Sunny | 9 to 22 mph WSW | 1% |
| Saturday Night | 39°F | Mostly Cloudy | 12 mph SW | 4% |
| Sunday | 56°F | Partly Sunny then Slight Chance Light Rain | 10 to 22 mph SW | 16% |
| Sunday Night | 37°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 18 mph WSW | 16% |
| Monday | 50°F | Partly Sunny | 8 mph WSW | 8% |
| Monday Night | 38°F | Mostly Cloudy | 7 to 10 mph SW | 6% |
| Tuesday | 52°F | Partly Sunny | 10 to 17 mph WSW | 14% |
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 Nov 4, 2026.