Sugarloaf, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sugarloaf, a community in Boulder County, Colorado.
This Afternoon
48°F
Sunny
Sunny. High near 48, with temperatures falling to around 39 in the afternoon. East northeast wind around 2 mph.
7-day forecast for Sugarloaf
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 48°F | Sunny | 2 mph ENE | 1% |
| Tonight | 31°F | Mostly Clear | 3 mph NW | 1% |
| Wednesday | 47°F | Partly Sunny then Chance Rain And Snow Showers | 0 to 6 mph NE | 27% |
| Wednesday Night | 31°F | Slight Chance Rain And Snow Showers then Mostly Cloudy | 2 mph NW | 24% |
| Thursday | 53°F | Sunny | 0 to 6 mph SE | 0% |
| Thursday Night | 33°F | Partly Cloudy | 0 to 3 mph W | 1% |
| Friday | 50°F | Mostly Sunny then Slight Chance Snow Showers | 0 to 3 mph N | 17% |
| Friday Night | 32°F | Slight Chance Snow Showers then Partly Cloudy | 2 to 7 mph WNW | 17% |
| Saturday | 54°F | Sunny | 0 to 9 mph NNW | 3% |
| Saturday Night | 33°F | Mostly Clear | 1 to 6 mph W | 2% |
| Sunday | 62°F | Sunny | 1 to 9 mph W | 0% |
| Sunday Night | 40°F | Mostly Clear | 10 mph W | 0% |
| Monday | 61°F | Mostly Sunny | 1 to 9 mph WNW | 0% |
| Monday Night | 39°F | Partly Cloudy | 1 to 6 mph W | 0% |
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.