NCAR and Flagstaff climbs, Chapman Drive and Boulder Canyon loop from Table Mesa

This challenging loop typically starts from the Table Mesa area in Boulder. You can find parking options around the NCAR Hill area, which is a common starting point for cyclists tackling these climbs. Be aware that parking can fill up, especially on weekends.

No, this route is generally considered a hard bike ride requiring very good fitness. It includes significant elevation gains, particularly on NCAR Hill and Flagstaff Road, which is known for being Boulder's toughest climb with sections as steep as 15%. Chapman Drive also has a consistent uphill grade.

The loop offers varied terrain. You'll encounter paved roads on NCAR Hill and Flagstaff Road. Chapman Drive is a 2.6-mile wide, smooth dirt/gravel trail closed to motorized traffic. Boulder Creek Path sections are paved, while Boulder Canyon Drive is a shared road with cars, featuring narrow shoulders and some broken concrete sections.

Given the mix of paved roads and the dirt/gravel surface of Chapman Drive, a robust road bike with appropriate gearing for steep ascents or a gravel bike would be ideal. Cyclists should be comfortable riding in traffic, especially on Boulder Canyon Drive.

The best times are typically spring, summer, and fall. Summer offers abundant wildflowers along Chapman Drive. Be prepared for varying conditions, as Boulder's weather can change quickly. Winter cycling is possible but may involve snow and ice, especially at higher elevations on Flagstaff Road.

You'll experience continuously changing scenery. The NCAR climb offers splendid views of the Flatirons. Flagstaff Road provides expansive views over Boulder Valley from Panorama Point, and higher up, sights include Crown Rock and the snow-capped peaks of the Indian Peaks from Lost Gulch Overlook. Chapman Drive winds through forest shade with scenic vistas and historic rock walls. Boulder Canyon is known for its jaw-dropping granite walls and Boulder Falls.

This route primarily follows roads and multi-use paths where dogs are generally allowed, but specific sections within Boulder Open Space and Mountain Parks may have leash requirements or restrictions. Always check local signage and regulations, especially on trails like Chapman Drive, which is part of the Open Space system.

No specific permits or entrance fees are required for cycling this loop. However, parts of the route pass through Boulder Open Space and Mountain Parks, which has regulations regarding trail use. You can find more information on the city's website: bouldercolorado.gov.

Yes, the route incorporates sections of Boulder's extensive bike path system. You will ride along parts of the Boulder Creek Path, Broadway Path, and the Boulder Canyon Trail, among others.

The Boulder Canyon Drive section can be stressful due to aggressive traffic and narrow shoulders. To mitigate traffic concerns, consider riding this part of the loop early in the morning when vehicle volume is typically lower.

This loop is quite challenging and covers approximately 33.2 kilometers (20.6 miles) with over 700 meters (2,300 feet) of elevation gain. On average, cyclists can expect to spend around 2 hours and 37 minutes to complete the entire route, depending on fitness level and stops.