Walker Ranch Loop at a glance: A 7.6-mile loop west of Boulder through varied terrain—forests, meadows, creek crossings, and historic ranch ruins. 1,500 feet cumulative elevation gain. Challenging but not technical. Plan 4-5 hours. Less crowded than in-town trails. Outstanding fall colors and wildflowers.
Trail Overview
Distance: 7.6-mile loop
Elevation gain: 1,500 feet cumulative
Difficulty: Moderate to strenuous
Time: 4-5 hours
Trailhead: Walker Ranch Trailhead (Flagstaff Road)
Walker Ranch is Boulder's escape from crowded trails. The 7.6-mile loop west of town feels like backcountry hiking, with diverse ecosystems, creek crossings, and remnants of a historic homestead. It's longer and more remote than Boulder's popular trails, rewarding those who make the effort.
Route Description
The loop can be hiked in either direction. Counter-clockwise (starting on South Boulder Creek Trail) puts the steepest climbing in the middle section. Clockwise starts with gradual climbing through meadows.
The trail passes through ponderosa pine forest, aspen groves, and open meadows. South Boulder Creek runs through the lowest section—crossings are usually easy but can be tricky during spring runoff. The historic Walker Ranch site includes cabin ruins and interpretive signs about the area's homesteading history.
Highlights
- Fall colors: The aspen groves turn brilliant gold in late September. One of Boulder area's best fall hikes.
- Wildflowers: Summer brings diverse wildflowers in the meadow sections.
- Historic ruins: The Walker Ranch homestead ruins offer a glimpse into 1800s mountain life.
- Creek scenery: South Boulder Creek provides a scenic backdrop in the lower sections.
- Solitude: Far less crowded than Chautauqua or Sanitas trails.
Tips
Parking: The main trailhead on Flagstaff Road has limited parking. Arrive early on weekends. Alternative parking at Ethel Harrold Trailhead connects to the loop.
Water: Bring at least 2 liters. The creek water is not potable without treatment.
Navigation: The loop is well-marked but has multiple trail junctions. Carry a map or download the Boulder OSMP app.
Season: Hikeable April-November. Snow can linger on north-facing slopes into spring. Fall (late September) is the best time for colors.
Dogs: Allowed on leash.
Facilities
- Small parking lot (free)
- Vault toilet at trailhead
- No water at trailhead
- Picnic tables
Frequently Asked Questions
Is Walker Ranch harder than Green Mountain?
Similar total effort—Walker Ranch is longer (7.6 vs 5.4 miles) but with less cumulative gain (1,500 vs 2,000 feet). Walker Ranch feels more like backcountry hiking.
Can I mountain bike Walker Ranch?
Yes. It's a popular mountain biking loop with challenging terrain. Bikers and hikers share the trail—be alert.
When are the fall colors best?
Late September to early October. The aspen groves along the loop turn brilliant gold. Check reports for peak timing.