Grass Valley Reservoir – New Castle loop from Harvey Gap State Park

The Grass Valley Reservoir – New Castle loop from Harvey Gap State Park is one of those road cycling routes that delivers a rewarding experience without demanding an entire day. This moderate 21.9-mile (35.2 km) road cycling route features 1331 feet (406 metres) of climbing, typically completed in about 1 hour and 38 minutes. It's a fantastic option if you're looking for a scenic, well-paced ride that combines natural beauty with a good workout.

What to expect on Grass Valley Reservoir – New Castle loop from Harvey Gap State Park

As you embark on this Grass Valley Reservoir New Castle loop cycling route, you'll find yourself traversing varied terrain, primarily on well-paved surfaces. The ride offers moderate climbs and descents, providing a consistent challenge without being overly strenuous. A major highlight is the magnificent, turquoise Grass Valley Reservoir itself, nestled within Harvey Gap State Park, offering scenic viewpoints. The landscape shifts between piñon-juniper woodlands and open sagebrush, all set against a backdrop of rolling hills. This route is ideal for road cyclists with good fitness who appreciate a mix of natural scenery and a solid workout.

Planning your visit

This popular road cycling route often starts from Harvey Gap State Park, which is a day-use-only location, meaning no overnight camping is permitted. Parking is available at the park, but it's always wise to arrive earlier in the day, especially during peak season. After your ride, consider heading into downtown New Castle, Colorado, where you can find local restaurants and shops for a post-ride refreshment. The area is known for its reservoir loops and moderate hill climbs, making it a great destination for road cyclists.

Trail details

• Distance: 21.9 miles (35.2 km)
• Elevation gain: 1331 feet (406 metres)
• Difficulty: moderate
• Estimated time: 1 hours and 38 minutes