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The hardest cycling climbs in Colorado. From this page you may navigate to the top 10 most difficult bicycling climbs in CO. The bike climbs we have documented are in the slideshow above. Scroll down the page to access The full Top 10 Colorado Bike Climbs "Table" below. The hardest, most difficult and challenging cycling climbs in Colorado are, in order of difficulty, 1. Pikes Peak, 2. Mount Evans, 3. Grand Mesa North, 4. Trail Ridge, 5. Grand Mesa South, 6. East Portal, 7. Independence Pass West, 8. Left Hand Canyon, 9. Wolf Creek Pass, South, and 10. Slumgulion Pass.