40
riders
5
rides
Road cycling routes around New Castle traverse a landscape characterized by river valleys, reservoirs, and state park areas. The terrain offers moderate climbs and descents, providing varied experiences for road cyclists. This region features routes that connect natural water bodies with surrounding open spaces, often with views of the surrounding hills.
Last updated: July 7, 2026
3
riders
64.8km
02:49
630m
630m
The New Castle to Rifle Gap State Park loop is a scenic road cycling adventure that immerses you in the diverse beauty of Colorado's landscape. You'll pedal through river valleys and open spaces, with the clear blue waters of Rifle Gap Reservoir providing a stunning contrast against the rugged backdrop of pinyon and cedar-covered mountains. The route offers continuous visual interest, from the Grand Hogback vistas to the tranquil state park areas, making it a rewarding experience for any cyclist.
This moderate 40.2-mile (64.8 km) road cycling route is generally well-paved and suitable for road bikes, featuring a rolling profile with about 2051 feet (625 metres) of elevation gain. It's a popular choice for local road cyclists and requires a moderate level of fitness to comfortably complete the approximately 2 hours and 49 minutes of cycling. If you're looking for New Castle to Rifle Gap State Park loop cycling routes that combine exercise with natural beauty, this is a prime candidate.
Situated at an elevation of about 6,000 feet, Rifle Gap State Park itself is a central feature, known for its 360-acre reservoir and the chance to spot wildlife like mule deer, elk, and various bird species. This loop highlights the region's unique blend of natural water bodies and expansive open landscapes, offering a memorable ride that showcases the best of Rifle Gap State Park bike trails.
10
riders
35.2km
01:38
400m
400m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

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3
riders
65.6km
02:50
600m
600m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
5
riders
75.5km
03:26
880m
880m
The New Castle – Rifle Gap Reservoir loop offers a dynamic road cycling experience through Garfield County's varied terrain. You'll pedal past picturesque river valleys, expansive hay meadows, and through pinyon-juniper woodlands, all while enjoying views of the impressive Rifle Gap Reservoir. Keep an eye out for local wildlife like mule deer and osprey as you navigate the rolling profile and sustained climbs.
This moderate 46.9-mile (75.5 km) route, with its 2899 feet (883 metres) of elevation gain, typically takes around 3 hours and 25 minutes to complete. It's a challenging ride that requires good fitness, especially given the significant elevation changes. Starting from New Castle, the route connects natural water bodies with open spaces, providing a diverse experience for cyclists.
Known as the most popular road cycling route in the New Castle area, this loop is a prime example of the region's excellent reservoir cycling. While primarily paved, be prepared for some potentially unpaved and difficult segments. The route's appeal lies in its blend of scenic beauty and physical challenge, making it a rewarding option for those seeking a substantial day on the bike.
4
riders
55.4km
02:23
460m
470m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
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Popular around New Castle
Good start/stop point is downtown New Castle at the Down Valley Brewery for a post ride beverage.
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Grass Valley Reservoir, located in Harvey Gap State Park, is a scenic lake set amid the Rocky Mountains.
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Rifle is located along the Colorado River and Interstate 70, just east of the Roan Plateau. While it's known for cattle ranching, there are however a wide variety of outdoor activities in the Rifle area.
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New Castle is just west of Glenwood Springs at 5,597 feet in elevation. The historic downtown area, with local restaurants and shops, is perfect for exploring on foot or bike.
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Rifle is located along the Colorado River and Interstate 70, just east of the Roan Plateau. While it's known for cattle ranching, there are however a wide variety of outdoor activities in the Rifle area.
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The Colorado River is one of the principal rivers in the Southwestern U.S. This section of the river offers lots of great fishing and rafting opportunities.
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This 350-acre reservoir is part of Rifle Gap State Park and provides some of Colorado's best boating, fishing, swimming and windsurfing. There is also a campground along the northern shore of the reservoir.
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Road cycling routes around New Castle, Colorado, traverse a landscape characterized by river valleys, reservoirs, and state park areas. The terrain offers moderate climbs and descents, providing varied experiences. You'll often find routes connecting natural water bodies with surrounding open spaces, frequently with views of the surrounding hills.
All 6 road cycling routes listed in this guide for New Castle are rated as moderate. While there aren't any specifically designated 'easy' routes, the moderate routes offer options for different ability levels. For example, the New Castle – Grass Valley Reservoir loop from New Castle is shorter, at 21.8 miles (35.2 km), which might be a good starting point for those looking for a less strenuous ride.
The road cycling routes around New Castle, Colorado, vary in length and elevation. You can expect distances ranging from approximately 21.8 miles (35.2 km) for routes like the New Castle – Grass Valley Reservoir loop, up to 43.1 miles (69.4 km) for the New Castle – Rifle Gap Reservoir loop. Elevation gains are moderate, typically between 400 and 740 meters (1,300-2,400 feet) per route.
The routes in this guide are generally rated as moderate, which means they might be more suitable for families with some cycling experience or older children. The terrain includes moderate climbs and descents. For very young children or those new to cycling, you might consider shorter sections or exploring local parks in the New Castle, Colorado area that offer paved paths.
Road cycling around New Castle, Colorado, offers scenic views primarily centered around reservoirs and state park landscapes. Routes often feature views of surrounding hills, river valleys, and open spaces. For example, the New Castle – Rifle Gap Reservoir loop circles a large reservoir, providing expansive water views.
Yes, all the road cycling routes featured in this guide for New Castle, Colorado, are circular loops. This means you'll start and end your ride in the same general area, making logistics like parking more convenient. Examples include the New Castle to Rifle Gap State Park loop and the Grass Valley Reservoir – New Castle loop from Harvey Gap State Park.
Given the region's characteristics with reservoirs and state parks, spring, summer, and fall are generally the best seasons for road biking in New Castle, Colorado. These seasons offer more favorable weather conditions, with less chance of snow or ice, and allow for full enjoyment of the natural landscapes. Winter cycling might be possible but could be impacted by colder temperatures and snow.
While not explicitly guaranteed, cycling through areas like Rifle Gap State Park and around various reservoirs in New Castle, Colorado, can offer opportunities for wildlife spotting. These natural habitats are home to various birds and other local fauna. Keeping an eye out, especially during quieter times of day, might reward you with sightings.
For road cycling routes around New Castle, Colorado, parking is typically available near the starting points of the loops, especially at state parks or designated trailheads. For instance, routes like the New Castle to Rifle Gap State Park loop would likely have parking facilities at or near the state park entrance or within the town of New Castle itself.
The primary attractions along the road cycling routes in this New Castle region (Colorado) are the natural features themselves, such as Rifle Gap Reservoir, Grass Valley Reservoir, and the landscapes of Rifle Gap State Park and Harvey Gap State Park. These offer scenic beauty and opportunities for outdoor enjoyment beyond just cycling.
The road cycling routes around New Castle, Colorado, often traverse more natural and open areas, connecting to state parks and reservoirs. While the routes themselves might not have frequent cafes or pubs directly along the path, the town of New Castle would be the primary place to find such amenities for pre- or post-ride refreshments.
This guide features 6 distinct road cycling routes around New Castle, Colorado. All of these routes are rated as moderate, offering a consistent level of challenge and enjoyment for road cyclists.


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