Sugarloaf (also spelled Sugar Loaf) is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States.

[4] Sugarloaf, sometimes spelled Sugar Loaf, Boulder County, was referred to in Colorado historical records dating back to 1868.

[6] In 1989, a destructive wildfire swept up and across much of Sugarloaf burning 2,100 acres (850 ha), destroying 44 houses and other structures, and causing approximately US$10 million in damages.

It is bordered by the Mountain Meadows CDP to the northeast, and North Boulder Creek forms part of the southern edge of the community.

Sugarloaf has a volunteer fire department—as of 2019, the department typically runs 30 to 45 members—which is a part of the Sugar Loaf Fire Protection District (SLFPD) covering approximately 17 square miles (44 km2) of territory, 500 homes, with land between 6,000 to 8,500 ft (1,800 to 2,600 m) elevation in mountainous terrain.