The best road cycling routes in Boulder County

Embark on the Ward, Lefthand Canyon, and Lee Hill loop from Pearl Street for a challenging racebike adventure through Roosevelt National Forest. This difficult route spans 46.3 miles (74.5 km) and demands a significant effort, climbing 4391 feet (1338 metres) over an estimated 3 hours and 59 minutes. As you ascend, you will be rewarded with continuously improving views, including fantastic vistas looking east over the plains from Lee Hill and wide-open meadows showcasing the often snow-capped Indian Peaks.

This demanding ride requires very good fitness, so prepare accordingly before you set out. Be aware that early spring conditions can sometimes bring sand onto the roads, which might affect safety, especially on descents. The Lee Hill section of the route features narrow shoulders, so exercise caution and stay alert for wildlife, particularly deer, as you navigate the downhill stretches.

Beyond the physical challenge, this loop offers a unique experience, passing through the small mountain town of Ward. You can make a stop at its friendly General Store, providing a pleasant break and a glimpse into local life amidst the scenic mountain landscape. The journey itself is a testament to the diverse beauty of the region, from expansive plains views to alpine meadows.

Embark on the Jamestown via Old Stage, Lefthand Canyon, and Lee Hill Drive from Pearl Street loop, a challenging road cycling route that spans 28.6 miles (46.0 km). You will climb a significant 2855 feet (870 metres) over an estimated 2 hours and 30 minutes, making this a moderate yet rewarding ride. The route offers varied scenery, from the tree-covered mountains of Lefthand Canyon, where you follow Lefthand Creek, to the expansive views over northeast Boulder from Old Stage Road.

When planning your ride, be aware that this route uses shared roads with moderate car traffic. Exercise caution, especially when navigating blind corners and during fast descents, to ensure your safety. You should also keep an eye out for wildlife, particularly deer, which are often seen in Lefthand Canyon and along Old Stage Road. For a convenient break, the Jamestown Mercantile Café provides a good spot for refreshments midway through your journey.

This loop takes you through parts of the Boulder Open Space and Mountain Parks, offering a peaceful experience away from urban bustle. As you cycle through Lefthand Canyon, you will pass sections of the Arapaho and Roosevelt National Forest, immersing you in a natural environment. The combination of sustained climbs and scenic descents makes this a notable route for cyclists seeking both a workout and beautiful surroundings in the region.

Embark on the Jamestown via Olde Stage and Highway 36 loop, a moderate racebike route that offers a rewarding challenge near Boulder, Colorado. You will cover 31.3 miles (50.4 km) and climb 2264 feet (690 metres) of elevation, typically taking around 2 hours and 27 minutes to complete. As you cycle, you will experience diverse scenery, from the expansive vistas over northeast Boulder found on Olde Stage Road to the serene, tree-covered mountains flanking Lefthand Canyon.

This popular route is generally accessible year-round, though you should always check current conditions as they can change with the seasons. While vehicular traffic is often accustomed to sharing the road with cyclists, staying vigilant is always a good practice. For a convenient stop, you can find refreshments and water refills at the Jamestown Mercantile Café, a traditional and welcoming spot along the way.

This classic ride takes you through parts of Roosevelt National Forest, providing a true escape into nature. The route winds alongside Lefthand Creek, where you might even spot some local wildlife amidst the scenic backdrop. A highlight of the journey is the charming mountain town of Jamestown, offering a pleasant break and a glimpse into local life.

This difficult racebike loop from Pearl Street takes you on a challenging 72.9 miles (117.2 km) journey. You will climb 2565 feet (782 metres) over an estimated 5 hours and 13 minutes, making it a demanding ride. As you cycle, you'll experience diverse terrain with the Rocky Mountains always in view. The route passes by several lakes and charming farms, offering glimpses of Haystack Mountain and the surrounding foothills. Make sure to pause at the Carter Lake Overlook for expansive views stretching eastward over the plains.

This long and difficult ride requires very good fitness, so plan your preparation accordingly. You should carry adequate water and snacks, as options for resupply are limited between Boulder and Carter Lake. Consider starting early to make the most of the daylight and avoid peak traffic. Unlocked public bathrooms might be available at Carter Lake South Shore Campground, which can be a useful stop.

The Hygiene and Carter Lake loop is a popular choice among local cyclists due to its varied landscape and consistent mountain backdrop. You will encounter a mix of open plains and rolling hills, providing a dynamic cycling experience. This route offers a great way to explore the region's natural beauty, combining agricultural scenery with impressive mountain vistas, making it a notable challenge for road biking enthusiasts.

Embark on an easy road cycling journey around the Boulder Reservoir, a 21.0-mile (33.7 km) loop that offers scenic views without demanding too much effort. You will gain 615 feet (187 metres) in elevation, making it a comfortable ride that typically takes about 1 hour and 25 minutes. As you pedal, you will see the sparkling waters of the reservoir and enjoy expansive vistas of the Flatirons and the Front Range peaks. The route also takes you through peaceful rural landscapes and past farms, with clear views of Haystack Mountain to the east. Keep an eye out for grazing cows along Niwot Road, adding to the pastoral charm of the ride.

This road cycling route is known for its excellent accessibility and well-maintained, mostly paved surfaces, making it suitable for cyclists of nearly any fitness level. You can easily start your ride from Pearl Street in Boulder, which provides convenient access to the loop. The trail is popular, so expect to encounter other riders, particularly on sections like Highway 36. This route is ideal for a relaxed outing, offering a pleasant experience for both solo riders and groups.

The Boulder Reservoir loop is a local favorite, celebrated for its blend of natural beauty and urban convenience. It showcases the unique character of Boulder's open spaces, where agricultural land meets stunning mountain backdrops. The presence of the reservoir itself provides a refreshing focal point, attracting various bird species and offering a sense of tranquility. This route is a prime example of how Boulder integrates outdoor recreation seamlessly into its community, providing an accessible escape for everyone.

Embark on the Sunshine and Fourmile Canyons to Gold Hill loop, a challenging road cycling adventure spanning 22.9 miles (36.9 km). You will climb a significant 3353 feet (1022 metres) over an estimated 3 hours and 19 minutes, making this a difficult route. As you pedal, you will experience diverse scenery, from winding roads through meadows and enchanting forests to panoramic views of the Rocky Mountains, with glimpses of the Indian Peaks from Sunshine Canyon. The route takes you to the historic mining town of Gold Hill, where you can pause at the charming Gold Hill General Store. This loop is a favorite among locals for its demanding climbs and rewarding descents.

Before you set out, be aware that this route is a mixed-surface ride, featuring significant unpaved and dirt sections, especially on Gold Run Road towards Gold Hill. For maximum comfort and enjoyment, wide tires of 32mm or more and low gears are highly recommended to tackle the varied terrain. This loop requires very good fitness due to its sustained climbs and considerable elevation gain, so plan your energy accordingly.

This particular route stands out in the Boulder Open Space and Mountain Parks for its unique blend of natural beauty and historical charm. The journey through Sunshine and Fourmile Canyons offers a dynamic cycling experience, culminating in the quaint, historic mining town of Gold Hill. It is a testament to the region's rugged landscape and past, providing both a physical test and a scenic escape into the foothills.

Embark on a challenging racebike adventure from Pearl Street, climbing towards the stunning Brainard Lake. This difficult route covers 51.5 miles (82.9 km) and demands significant effort, with a massive 6011 feet (1832 metres) of elevation gain. You will transition from Boulder's urban edge into thick forests and then wide open meadows, enjoying exceptional views of the surrounding mountains before reaching the serene lake. Expect to spend around 4 hours and 48 minutes on this demanding journey.

This is a hard road ride that requires very good fitness due to its steep gradients, with some sections reaching up to 13%. While most of the route is well-paved, be prepared for some segments that might be unpaved and challenging. Cyclist-awareness signs are present along Left Hand Canyon, indicating a bike-friendly environment for your ride.

The route offers a unique blend of Boulder's charm and the majestic Rocky Mountains, culminating at the crystal-clear Brainard Lake. This journey is notable for its significant elevation profile, making it a true test of endurance and a rewarding experience for experienced cyclists seeking a substantial climb into the high country.

Embark on the Chapman Drive and Flagstaff Mountain Loop, a moderate road cycling route that blends a car-free dirt road climb with smooth paved sections. As you pedal, you will experience varied scenery, from the shaded, winding paths of Chapman Drive to the dense pine forests higher up. The route covers 13.1 miles (21.0 km) with a significant elevation gain of 1679 feet (512 metres), typically taking around 2 hours and 19 minutes to complete, offering rewarding views of Boulder, the plains, and the Indian Peaks from spots like Artist Point.

Before you head out, be aware of potential construction at the Chapman Trailhead, which might affect the Highway 119 underpass. This could mean you need to cross Boulder Canyon Drive at grade instead. Chapman Drive itself is closed to motorized vehicles, ensuring a peaceful climbing experience for cyclists. Plan your visit accordingly to enjoy the ride without unexpected detours.

This loop is a favorite among local cyclists for its unique combination of terrain and the stunning vistas it provides. You will find yourself immersed in nature, with opportunities to spot vibrant wildflowers, especially after late-spring rains. The route offers a distinct cycling experience, setting it apart from other rides in the area by providing both a challenging climb and expansive panoramic views.

Embark on a moderate road cycling adventure with the Olde Stage and Nelson Road loop, a route that spans 29.3 miles (47.2 km) and climbs 1564 feet (477 metres) over approximately 2 hours and 26 minutes. You will experience varied scenery, from open fields with horses and cows along Nelson Road offering expansive views of the Foothills and Lefthand Canyon, to the peaceful Cottonwood Trail winding beside a creek. The climb up Olde Stage Road provides a rewarding vista over northeast Boulder between the hills, making the effort worthwhile.

This challenging loop demands very good fitness due to its steep climbs, with some sections of Olde Stage Road reaching a 13.4% grade. While much of the route is paved, be prepared for crushed gravel sections, particularly on the Cottonwood Trail, which makes a gravel bike or a road bike with wider tires ideal. You should also be mindful of moderate car traffic on shared roads and the potential for deer sightings, especially on Olde Stage Road.

This route stands out for its blend of rural tranquility and urban connectivity, starting conveniently from Pearl Street. As you follow Lefthand Creek, you might spot local wildlife, adding to the natural charm of the ride. The diverse terrain and scenic overlooks make it a notable option for cyclists looking for a substantial workout combined with picturesque views in the Boulder area.