Overview
Crater Lake Trail via Hessie Trailhead accesses Indian Peaks Wilderness from the southern side, reaching a different set of valleys and lakes than the heavily used Brainard Lake corridor. The approach follows the South Fork of Middle Boulder Creek through dense conifer forest and open wildflower meadows before climbing to Crater Lake at roughly 10,400 feet in a rocky cirque below the Devil's Thumb massif.
The trail is 5.2 miles round trip with 1,200 feet of gain, making it more accessible than the longer and higher-elevation Brainard Lake routes while still delivering genuine Indian Peaks scenery. On summer weekends, Hessie Trailhead sees significant use, but it typically holds fewer visitors than Brainard Lake, and parking is free. The trade-off: parking overflow is common, and you may add a half-mile or more of road walking to reach the trailhead itself.
Dogs are allowed on leash throughout. No day-use permit beyond the free trailhead access is currently required. Check current conditions and permit requirements before your trip, as Indian Peaks regulations have been changing in response to use pressure.
The Route
Miles 0 to 0.5: Hessie Trailhead to the creek crossing. The trail leaves Hessie Trailhead (sometimes shown on maps as the old Hessie townsite area) and heads west along a broad, easy path. You'll cross the South Fork of Middle Boulder Creek on a footbridge in the first half mile. The creek here runs clear and cold; in early July, it can be high with snowmelt.
Miles 0.5 to 1.8: Valley floor approach. Beyond the creek crossing, the trail continues west through subalpine spruce-fir forest interrupted by open meadow sections. In late July, the meadows along this section are filled with wildflowers: fireweed, paintbrush, blue columbine (Colorado's state flower), and yellow monkeyflower along the creek edges. The grade is gentle, gaining elevation gradually.
Miles 1.8 to 2.6: Upper basin climb to Crater Lake. At the junction for the Jasper Lake and Crater Lake routes (signed), bear left toward Crater Lake. The trail steepens and enters more open terrain as the forest gives way to krummholz and then alpine tundra. The final push to the lake involves a short, rocky climb. Crater Lake appears in a bowl-shaped cirque rimmed by the lower flanks of the Devil's Thumb massif. Mount Jasper and the ridges above form the headwall. The lake's surface is calm on still mornings.
Descent: Return the same way. The creek crossing is easy at the bridge. If the bridge is out in early season (occasionally occurs after heavy runoff), evaluate conditions carefully before attempting a ford.
Devil's Thumb Pass Extension
Those wanting more distance and elevation can continue past Crater Lake toward Devil's Thumb Pass (11,747 ft), about 1.3 miles and 1,300 additional feet above the lake. The pass is above treeline and exposed. The total round trip from Hessie to the pass and back is approximately 9 miles with about 2,500 feet of gain - a significant step up in difficulty from the Crater Lake day hike. Factor in afternoon thunderstorm timing: be off the pass and below treeline by 1 PM.
Permits and Fees
Parking at Hessie Trailhead is free. No day-use permit is currently required for this trail. Overnight camping in Indian Peaks Wilderness requires a reservation through Recreation.gov ($6 per group per night). Dispersed camping is permitted in designated zones within the wilderness; check current regulations with the Boulder Ranger District.
For general guidance on national forest camping permits, see our camping permit guide. The America the Beautiful pass provides no specific benefit at this free-access trailhead but covers day-use fees at other developed sites in the region.
When to Hike
July through September is the core season. The lower valley sections are accessible by late June in most years, but the upper basin near Crater Lake can hold snow and the trail can be wet and muddy until early July. Snow typically clears from the lake cirque by mid-July.
July brings peak wildflower displays in the South Fork meadows. The period from mid-July through late July is among the best for wildflowers in the entire Indian Peaks area.
September is excellent for this trail: the meadows have turned to gold and rust, crowds are smaller, and morning weather tends to be stable. The trail can be icy in early October above the lake.
Lightning and storms: The upper basin above the lake is above treeline. Afternoon thunderstorms are common in July and August. Start early and plan to be at the lake by 11 AM or noon, then descend before afternoon weather builds.
What to Bring
Water: Carry water from town. Many hikers fill a water bottle and use a filter for creek water if needed; individual needs vary with distance and temperature. The lower valley creek is accessible for filtering.
Layers: The lake cirque can be cool and windy even when the valley below is warm. A wind layer and a midlayer are worth packing.
Footwear: Trail runners or hiking boots with grip. The upper rocky section and any muddy lower sections in early season can be slippery in casual shoes.
Navigation: Download an offline map. The Hessie Trailhead area has several trail junctions; know the correct route before leaving cell service.
Bear canister or bear spray: Indian Peaks Wilderness has black bear activity. Review our bear canister guide for current requirements and recommendations. Leave No Trace food storage practices apply throughout.
Trailhead Access
From Nederland, take CO-72 south briefly and turn right (west) on 4th of July Road. Follow the road west about 1.5 miles to the Hessie Trailhead. The road is unpaved and narrow, passable for standard vehicles in dry conditions. On summer weekends, the trailhead lots fill completely, and roadside parking begins along 4th of July Road. Walk to the trailhead from wherever you park.
Nederland is about 15 miles west of Boulder on CO-119. The drive from Boulder to the trailhead is 45 to 50 minutes. No services at the trailhead. Vault toilets available. No cell service.
For those wanting to combine multiple trails in the area, the Long Lake Loop and Pawnee Pass Trail at Brainard Lake are about 20 minutes north via the Peak-to-Peak Highway.
Practice Leave No Trace principles throughout. This wilderness corridor is under heavy use pressure, and the alpine vegetation recovers slowly from off-trail trampling and improper camping.