Sugarloaf, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sugarloaf, a community in Boulder County, Colorado.
This Afternoon
72°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 72, with temperatures falling to around 59 in the afternoon. South southwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Sugarloaf
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Showers And Thunderstorms Likely | 5 mph SSW | 63% |
| Tonight | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph W | 30% |
| Saturday | 67°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 6 mph SSW | 73% |
| Saturday Night | 46°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 2 mph WSW | 40% |
| Sunday | 63°F | Chance Showers And Thunderstorms | 1 to 5 mph NNW | 33% |
| Sunday Night | 44°F | Chance Rain Showers then Partly Cloudy | 2 mph WNW | 26% |
| Monday | 64°F | Sunny | 0 to 7 mph SSE | 5% |
| Monday Night | 47°F | Mostly Clear | 2 mph NNW | 7% |
| Tuesday | 68°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph ENE | 40% |
| Tuesday Night | 48°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph S | 24% |
| Wednesday | 68°F | Partly Sunny then Chance Showers And Thunderstorms | 3 mph ENE | 40% |
| Wednesday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 2 mph SSW | 22% |
| Thursday | 67°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph NNW | 26% |
| Thursday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 2 mph SSW | 27% |
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 Sep 19, 2026.