Horizon Colony, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Horizon Colony, a community in Toole County, Montana.
Today
46°F
Mostly Sunny
Mostly sunny. High near 46, with temperatures falling to around 41 in the afternoon. Southwest wind 2 to 6 mph.
7-day forecast for Horizon Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 46°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Tonight | 28°F | Partly Cloudy | 5 to 12 mph S | 0% |
| Thursday | 49°F | Partly Sunny | 12 to 22 mph WSW | 1% |
| Thursday Night | 32°F | Partly Cloudy | 13 to 18 mph WSW | 1% |
| Friday | 49°F | Mostly Sunny | 13 to 22 mph WSW | 0% |
| Friday Night | 37°F | Mostly Cloudy | 15 to 26 mph WSW | 1% |
| Saturday | 55°F | Mostly Sunny | 8 to 15 mph WSW | 1% |
| Saturday Night | 37°F | Mostly Cloudy | 9 mph SSW | 0% |
| Sunday | 57°F | Partly Sunny | 9 to 28 mph SW | 0% |
| Sunday Night | 35°F | Mostly Cloudy | 9 to 23 mph WSW | 0% |
| Monday | 49°F | Partly Sunny | 9 mph SW | 0% |
| Monday Night | 35°F | Mostly Cloudy | 7 to 13 mph SW | 0% |
| Tuesday | 53°F | Partly Sunny | 13 to 17 mph WSW | 1% |
| Tuesday Night | 37°F | Partly Cloudy | 9 to 16 mph WSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Horizon Colony (48.717, -112.228). Updated through the day.
Growing snapshot for Horizon Colony
Last spring frost
May 23
First fall frost
Sep 16
Growing season
115 days
Hardiness zone
4a
More local growing data for Horizon Colony: nearby ZIP 59435 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Shelby
Sunburst
Sweet Grass
Climate data from the nearest NOAA station, Shelby, Mt (9.5 mi from Horizon Colony). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.