Horizon Colony, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Horizon Colony, a community in Toole County, Montana.
This Afternoon
67°F
Mostly Sunny
Mostly sunny, with a high near 67. North northeast wind around 9 mph.
7-day forecast for Horizon Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Sunny | 9 mph NNE | 0% |
| Tonight | 48°F | Mostly Cloudy | 5 to 9 mph NNE | 1% |
| Saturday | 67°F | Mostly Sunny | 5 to 12 mph E | 0% |
| Saturday Night | 45°F | Partly Cloudy | 6 to 12 mph SSE | 0% |
| Sunday | 70°F | Sunny | 6 to 10 mph SSE | 0% |
| Sunday Night | 46°F | Mostly Clear | 6 to 12 mph SSE | 0% |
| Monday | 75°F | Sunny | 5 to 9 mph S | 0% |
| Monday Night | 48°F | Mostly Clear | 10 mph WSW | 0% |
| Tuesday | 70°F | Mostly Sunny | 6 to 9 mph WNW | 0% |
| Tuesday Night | 48°F | Mostly Clear | 5 to 8 mph SSW | 0% |
| Wednesday | 71°F | Sunny | 6 to 14 mph WSW | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 6 to 12 mph WSW | 3% |
| Thursday | 70°F | Mostly Sunny | 5 to 8 mph SSW | 3% |
| Thursday Night | 48°F | Partly Cloudy | 6 to 9 mph S | 1% |
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
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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 Sep 19, 2026.