What is the maximum grade on Colorado mountain passes?

Buckle up and brace yourself, for we're about to embark on a roller-coaster journey through Colorado's towering titans. From the whispering pines to the snow-capped peaks, Colorado is not just a state; it's a state of mind for thrill-seekers.

Maximum grades on Colorado mountain passes

Dive in, as we traverse the list of the most vertigo-inducing, heart-racing, and downright steepest mountain passes this Rocky Mountain paradise has to offer. Whether you're a seasoned adventurer or a curious traveler, these passes promise exhilaration with every twist and turn. Ready to elevate your adventure? Let's climb!

 Name  Highway  Elevation  Maximum Grade
Mt.Evans SH 5 14,150’ 9%-15% 
Independence SH 82  12,095’ 6% 
Trail Ridge High Point  U.S. 34  12,183’  5.4% 
Loveland  U.S. 6   11,992’  6% 
Hoosier  SH 9  11,541’  8% N 
Slumgullion  SH 149  11,361’  9.4% N; 7.9% S 
Fremont  SH 91  11,318’  5.7% 
Berthoud  U.S. 40  11,315’  6.1% N; 6% S 
Monarch   U.S. 50  11,312’  6.4% 
Eisenhower Tunnels Approaches   I-70  11,158’  6% W 
Red Mountain  U.S. 550  11,018’  7%+ 
Molas  U.S. 550  10,910’  7% + 
Spring Creek  SH 149  10,901’  7.5% 
Wolf Creek  U.S. 160  10,850’  6.8% 
Milner  U.S. 34  10,758’  5.4% 
Vail  I-70  10,666’  7% 
Coal Bank   U.S. 550  10,640’  6.5% 
Tennessee  U.S. 24  10,424’   6% 
Cameron  SH 14  10,276’  3.8% E 
La Manga  SH 17  10,230’  5.2% 
Lizard Head  SH 145  10,222’  4.1% 
North/North Cochetopa  SH 114  10,149’  6% 
Cumbres  SH 17  10,022’  6.3% 
Kenosha  U.S. 285  10,001’  5.3% E 
Red Hill   U.S. 285  9,993’  6% 
Cucharas  SH 12  9,941’ 5.9% N; 5.4% S 
Squaw  SH 103  9,807’  6% 
Willow Creek  SH 125  9,621’ 6.3% 
Gore  SH 134   9,527’  6.3% 
Wilkerson  U.S. 24 9,507’ 5.8%
Rabbit Ears U.S. 40 9,426’  6.8% N
La Veta/North La Veta U.S. 160 9,413’ 6%
Trout Creek  U.S. 24/285 9,346’  5.2%
Ute  U.S. 24 9,165’ 5.6% E
Poncha U.S. 285 9,010’  3%
Dallas Divide SH 62 8,970’ 6.4% E; 5% W
Muddy  U.S. 40 8,772’ 5.6%
McClure SH 133 8,755’ 8%
Douglas SH 139 8,268’ 7%
Raton I-25 7,834’ 6%