Sugarloaf, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sugarloaf, a community in Boulder County, Colorado.
Today
69°F
Patchy Smoke
Patchy smoke before noon, then patchy smoke and a slight chance of showers and thunderstorms. Mostly sunny. High near 69, with temperatures falling to around 63 in the afternoon. East wind around 7 mph. Chance of precipitation is 20%.
7-day forecast for Sugarloaf
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Patchy Smoke | 7 mph E | 22% |
| Tonight | 52°F | Patchy Smoke | 1 to 6 mph ESE | 15% |
| Wednesday | 77°F | Mostly Sunny | 3 to 7 mph NNE | 2% |
| Wednesday Night | 52°F | Mostly Clear | 2 to 6 mph SW | 1% |
| Thursday | 84°F | Sunny | 2 to 6 mph NNW | 2% |
| Thursday Night | 56°F | Clear | 6 mph NW | 1% |
| Friday | 86°F | Sunny | 2 to 6 mph NNE | 0% |
| Friday Night | 60°F | Mostly Clear | 2 to 7 mph WNW | 0% |
| Saturday | 88°F | Sunny | 3 to 7 mph NNW | 5% |
| Saturday Night | 62°F | Mostly Clear | 6 mph NW | 1% |
| Sunday | 87°F | Sunny | 5 mph N | 10% |
| Sunday Night | 63°F | Partly Cloudy | 6 mph NW | 8% |
| Monday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 6 mph N | 44% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph W | 24% |
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 Aug 4, 2026.