Horizon Colony, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Horizon Colony, a community in Toole County, Montana.
Overnight
28°F
Mostly Cloudy
Mostly cloudy, with a low around 28. Northwest wind around 8 mph.
7-day forecast for Horizon Colony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Mostly Cloudy | 8 mph NW | 0% |
| Wednesday | 46°F | Mostly Sunny | 2 to 7 mph W | 0% |
| Wednesday Night | 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% |
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
Camrose Colony
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Rimrock Colony
Santa Rita
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.