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Boulder is always in the top handful of bike friendly US cities in annual surveys (see, Bouldercolorado.gov). We have visited Boulder 3 times to cycle and have always been struck by how cycling-centric it is. Other than Rock Creek Road in the Owens Valley, we have not seen so many and diverse bike-related roadway signs anywhere in the US. If Boulder is the hub for your Colorado cycling trip, you are in striking distance of the Denver Area Big Three: Pikes Peak (102 miles), Mount Evans 44 miles) and Trial Ridge (36 miles).
This page provides a comprehensive summary of the steepest, most scenic, and best climbs in Boulder. These epic road bike climbs can be viewed on this page via the map (zoom in to view climbs in particular areas), by Climb Cards (photo and stats), or by a detailed list that can be arranged in metric or imperial units by difficulty, distance (longest climbs in the area), altitude gained, highest elevation (highest summit), average grade (sort by varying distances), lowest start point, etc. Visit the Climb Page to see details and photos for that particular bike climb.
The hardest bike climbs in Boulder are 1. Left Hand Canyon - Ward - Brainard Lake, 2. Lefthand Canyon to Ward, 3. Magnolia Road, 4. Sugarloaf Rd , 5. Flagstaff Road, 6. Left Hand Canyon - Super James, 7. Lee Hill - Deer Trail, 8. Boulder Canyon, 9. Sunshine Canyon, and 10. Lee Hill