US 285 highlighted in red | ||||
Route information | ||||
Auxiliary route of US 85 | ||||
Maintained by CDOT | ||||
Length | 263.87 mi[1] (424.66 km) | |||
Major junctions | ||||
South end | ![]() | |||
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North end | ![]() ![]() ![]() | |||
Location | ||||
Country | United States | |||
State | Colorado | |||
Counties | Conejos, Alamosa, Rio Grande, Saguache, Chaffee, Park, Jefferson, Arapahoe, Denver | |||
Highway system | ||||
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U.S. Route 285 (US 285) is the section north-south highway in Colorado that starts at the New Mexico state line and ends at I-25, US 87, and SH 30 in Denver.