Sugarloaf, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sugarloaf, a community in Boulder County, Colorado.
Today
47°F
Partly Sunny then Chance Rain And Snow Showers
A chance of rain and snow showers after 5pm. Partly sunny. High near 47, with temperatures falling to around 38 in the afternoon. North northeast wind 0 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sugarloaf
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 47°F | Partly Sunny then Chance Rain And Snow Showers | 0 to 7 mph NNE | 29% |
| Tonight | 31°F | Chance Rain And Snow Showers then Mostly Cloudy | 2 mph NNW | 29% |
| Thursday | 50°F | Sunny | 0 to 5 mph SE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Friday | 50°F | Slight Chance Rain Showers then Slight Chance Rain And Snow Showers | 0 to 3 mph N | 23% |
| Friday Night | 31°F | Slight Chance Rain And Snow Showers then Mostly Clear | 1 to 6 mph WNW | 23% |
| Saturday | 53°F | Sunny | 0 to 9 mph N | 1% |
| Saturday Night | 33°F | Mostly Clear | 1 to 5 mph W | 0% |
| Sunday | 60°F | Sunny | 1 to 8 mph W | 0% |
| Sunday Night | 39°F | Mostly Clear | 5 to 8 mph W | 0% |
| Monday | 60°F | Sunny | 0 to 8 mph WNW | 0% |
| Monday Night | 38°F | Partly Cloudy | 0 to 3 mph W | 0% |
| Tuesday | 58°F | Mostly Sunny | 1 to 5 mph W | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 1 to 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Sugarloaf (40.019, -105.408). Updated through the day.
Growing snapshot for Sugarloaf
Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Sugarloaf: nearby ZIP 80302 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Boulder, Co (4.9 mi from Sugarloaf). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.