Boulder Canyon Trail

Boulder Canyon Trail at a glance

The Boulder Canyon Trail is Boulder's easiest way to get into the mountains without climbing anything. It's a Boulder County Parks & Open Space trail that leaves the west edge of town, ducks into the mouth of Boulder Canyon, and follows Boulder Creek upstream for about two and a half miles to the Chapman Drive Trailhead. The creek is loud, the canyon walls are close, and the grade is so gentle that most people notice the elevation only on the way back down.

It's a genuinely useful piece of trail, not just a walk. Because the east end joins the City of Boulder's Boulder Creek Path, you can start at the library or Eben G. Fine Park and be in a canyon within twenty minutes, on foot or on a bike, without ever getting in a car.

How long is the Boulder Canyon Trail, really

About 2.5 miles one way. We'll be straight about the confusion here, because it's the first thing people search for. Boulder County's trail page says 2.6 miles in its description and 2.3 miles in the trail table further down the same page. The county's published trail-segment data, which is what its maps are drawn from, measures the trail at 13,292 feet, or 2.5 miles. That's the figure we use. Whichever number you pick, an out-and-back is right around five miles and takes most walkers a bit over two hours.

Surface, width, and how it actually rides

The trail is recorded at 10 feet wide, and the surface alternates. Boulder County's data breaks it into roughly 1.1 miles of concrete and roughly 1.4 miles of crusher fines, the compacted decomposed-granite surface used across the county's trail system. In practice that means smooth pavement in stretches and firm gravel in others. A hybrid, gravel, or mountain bike is the comfortable choice. Strollers and most wheelchairs can handle the concrete sections, though neither Boulder County nor the City of Boulder lists this trail as an accessible trail, and the crusher-fines sections are softer going.

Where it starts, where it ends, and how to get there

Heading west, the county trail begins in the lower canyon where the Boulder Creek Path hands off, above Eben G. Fine Park at 101 Arapahoe Avenue. There is no formal trailhead or parking lot at that end, which is part of why walking or riding in from town is the sensible approach. At the far end the trail arrives at the Chapman Drive Trailhead, about 4 miles up Boulder Canyon at 38471 Boulder Canyon Drive, on the east side of the road. That lot is unpaved and free, with 15 standard spaces, one accessible space, trailer parking, two picnic tables, and a bike rack with a repair stand and pump. There are no restrooms there. Boulder County also notes several informal pullouts along CO 119, but the canyon road is fast and narrow, so pick them carefully.

From Chapman Drive you can keep going uphill on the City of Boulder's Chapman Drive Trail, a 2.6-mile climb to Realization Point below Flagstaff Mountain, which turns a flat creekside outing into a real day. Different agency, different rules: dogs are leash-required on Chapman Drive up to the Tenderfoot Trail junction.

Dogs, bikes, e-bikes, and horses

This is a designated multi-use trail, and it's shared. Dogs are allowed, but Boulder County requires every pet to be leashed and under the owner's physical control at all times, and to have its waste picked up and carried out. The off-leash Voice and Sight tag used on some City of Boulder trails doesn't apply on county open space. Bikes and horses are allowed. Class 1 and Class 2 e-bikes were approved here on July 1, 2023, after years of being an explicit exception; Class 3 e-bikes are still prohibited on Boulder County open space. More on riding around town in our Boulder biking guide.

The narrowed bridge, and a closure that's coming

One thing to know before you go. A large hole formed under the trail near the bridge about a quarter mile east (downhill) of Fourmile Canyon Drive. Boulder County closed that bridge, then put in a temporary repair on April 3 and reopened the trail. The hole is still there. A chain fence blocks the damaged area and narrows the bridge from its full 10 feet to about 6 feet, so you have to pass single file and give other people room. The county says short-notice closures are possible while it monitors the repair, and that the trail will close outright when the permanent fix is built, which needs heavy equipment in Boulder Creek and can only happen in late fall or winter when flows are low. Check the county's trail page before a long drive.

Hours, fees, and the best time to go

There's no fee, at either end. The Boulder Canyon Trail is also one of a short list of Boulder County trails that stays open 24 hours a day instead of closing at sunset, though the trailheads themselves close at sunset and you can't park between sunset and sunrise. It's open year-round with no published seasonal closure. Boulder County's visitor counters show May through September as the busiest months and 9 a.m. to noon as the busiest block of the day, so an early start or a weekday evening buys you a quieter canyon. The trail sits between roughly 5,480 and 5,810 feet, low enough that it's usually walkable in winter, but the canyon is shaded and north-facing in places, so expect ice after storms.

One local note we can't verify with the managing agency: the lower canyon carried a narrow-gauge railroad in the 1880s, and the trail is often described locally as following that old grade. Boulder County doesn't describe the alignment that way on its trail page, so treat it as canyon lore rather than a documented fact.

How it relates to the Boulder Creek Path and Boulder Falls

Think of it as three things end to end. The Boulder Creek Path is the City of Boulder's 5.5-mile paved spine across town, from the Stazio ballfields near 55th Street west to the mouth of the canyon. The Boulder Canyon Trail picks up where that ends and carries you 2.5 miles up the canyon to Chapman Drive. Boulder Falls is a separate roadside stop much farther up, around 11 miles from town on Highway 119, reached from a pullout and not connected to this trail. It has been closed since a 2024 rockslide while the city designs a new viewing platform, so don't build a day around it.

Related guides

• Boulder Creek Path: the paved 5.5-mile path across town that this trail connects to.
• Boulder Falls: the roadside waterfall farther up Boulder Canyon, and its current closure.
• Hiking in Boulder: the full hiking hub, sorted by difficulty.
• Best easy hikes near Boulder: more low-grade options if this one suits you.
• Hiking with dogs in Boulder: leash rules and Voice and Sight, agency by agency.
• Nederland: the town at the top of Boulder Canyon, 17 miles up Highway 119.

Boulder Canyon Trail FAQ

Sources

Facts on this page are drawn from these authoritative sources:

• Boulder County: Boulder Canyon Trail (length, difficulty, allowed uses, parking, bridge repair, visitation)
• Boulder County: Open Space Regulations (24-hour trail exception, leash rule, parking hours)
• Boulder County: E-bikes on Open Space (Class 1 and 2 approved July 1, 2023)
• Boulder County Open Data: Parks & Open Space trail segments (2.5-mile measured length, 10-foot width, concrete and crusher-fines surface)
• City of Boulder: Chapman Drive Trailhead (parking spaces, facilities, Chapman Drive Trail length, dog rules)
• City of Boulder: Boulder Creek Path (5.5-mile length, endpoints)
• City of Boulder: new visitor access for Boulder Falls (ongoing Boulder Falls closure)
• USGS 3DEP Elevation Point Query Service (trail-end elevations, since no agency publishes an elevation-gain figure)