One of My Favorite Hikes in Mammoth Lakes: Coldwater Trailhead to Duck Lake
By Matthew Lehman Local Real Estate Broker & Outdoor Enthusiast | Mammoth Lakes, CA
If you’re dreaming of a life where world-class hiking starts just minutes from your front door, Mammoth Lakes delivers in spades. One of my absolute favorite day hikes, and one I recommend to clients and friends all the time, is the trek from the Coldwater Campground trailhead up to Duck Lake via Duck Pass.
This ~10-mile round-trip adventure (roughly 5 miles each way) is a true Eastern Sierra classic. It’s challenging, beautiful, and ends with one of the most satisfying payoffs in the John Muir Wilderness.
Hike at a Glance
- Distance: ~10 miles round trip (to the edge of Duck Lake)
- Elevation: Starts at approximately 9,100 ft | Reaches 10,800 ft at Duck Pass
- Elevation Gain: ~1,700+ ft
- Difficulty: Strenuous (high altitude, steep rocky sections, and sustained climbing)
- Best Season: Mid-July through September (typically snow-free)
- Trailhead: Duck Pass Trailhead at the back of Coldwater Campground (day-use parking)
- Highlights: Arrowhead Lake, Skelton Lake, Barney Lake, epic views from Duck Pass, and the deep sapphire waters of Duck Lake
Getting to the Trailhead
From downtown Mammoth Lakes, head west on Main Street / Highway 203, which becomes Lake Mary Road. Continue past Lake Mary and take the turn for Coldwater Campground. The signed Duck Pass Trailhead and day-use parking area are at the very end of the campground road.
Arrive early on weekends and holidays. This is a popular trail and parking fills up fast. There are restrooms and a water spigot at the trailhead. You’ll also notice slash piles in the parking area as part of local forest fuel reduction and fire mitigation efforts (link to your internal slash piles page here).
The Hike: A Journey Through Alpine Gems
The trail starts in a pleasant lodgepole pine forest and immediately begins climbing. You’ll quickly enter the John Muir Wilderness.
Early Miles: Arrowhead & Skelton Lakes
Within the first mile, side trails lead toward Arrowhead Lake (easy to spot from above; it really does look like an arrowhead). A little farther on, you’ll reach Skelton Lake (about 1.7 miles in). This shimmering alpine pool is a perfect early stop for photos, a snack, or just soaking in the quiet. The water is crystal clear and the surrounding granite and peaks already feel worlds away from town.
Barney Lake & the Build-Up
Continuing onward, the trail passes through meadows and boulder fields before reaching Barney Lake around the 2.7-mile mark. This bright turquoise lake sits in a stunning cirque below the Mammoth Crest. It’s a favorite lunch or fishing spot for many hikers. Take a moment here; the scenery is already world-class.
The Rocky Slug: Switchbacks to Duck Pass
After Barney Lake, the real work begins. The trail launches into a series of steep, rocky switchbacks through talus and scree. This is the “rocky slug” section: exposed, unrelenting, and exactly why this hike earns its strenuous rating.
But here’s the secret: turn around often. The views back down the valley toward Barney Lake, Skelton, and the broader Lakes Basin get better with every step. The climbing is tough on the lungs (hello, 10,000+ feet), but the payoff is immediate and spectacular.
At roughly the 4-mile mark, you crest Duck Pass at 10,800 feet. This broad saddle on the Pacific Crest offers sweeping views south toward the Silver Divide and your first dramatic glimpse of Duck Lake far below, a deep, almost impossibly blue alpine jewel tucked into a cirque of 11,000-foot peaks.
The Reward: Duck Lake
From the pass, it’s another mile or so of descent (with a few small ups and downs) to reach the outlet of Duck Lake itself, right around the 5-mile mark.
Standing at the edge of this pristine lake, surrounded by stark granite, lingering snow patches, and jagged peaks, you’ll understand why I keep coming back. The color of the water, the silence (or the wind), the sense of having earned this view… it’s pure High Sierra magic.
This is the kind of place that makes you pause, breathe deeply, and remember why you chose to build (or buy) a life in Mammoth Lakes.
Practical Tips for Success
- Altitude is real. Even strong hikers feel it above 9,000 ft. Take it slow, stay hydrated, and consider spending a day or two in Mammoth acclimating before attempting this hike.
- Pack smart. Bring more water than you think you need, salty snacks, sunscreen, a hat, and layers. Weather can change quickly at elevation.
- Trekking poles help. Especially on the rocky descent and the steep switchbacks.
- Check conditions. Visit the Inyo National Forest website or stop by the Mammoth Lakes Welcome Center for current trail and snow reports.
- Leave No Trace. Pack out everything. Camping is not permitted within 300 feet of Duck Lake’s outlet.
- Dogs: Generally allowed (on leash in developed areas; check current rules).
- Day hike vs. overnight: This makes an excellent (long) day hike. Backpackers can continue south on the John Muir Trail toward Purple Lake or Lake Virginia.
Why This Hike Defines the Mammoth Lakes Lifestyle
For me, this trail embodies everything that makes Mammoth special: immediate access to genuine wilderness, jaw-dropping scenery, physical challenge, and that deep sense of reward that only comes from earning your views.
It’s the same reason so many of my clients fall in love with the area and this lifestyle, whether they’re buying a ski-in/ski-out home, a condo near the Village, or a property with quick access to the Lakes Basin trailheads. You don’t just visit nature here. You live in it.
If you’re considering a move or second home in Mammoth Lakes and want the kind of lifestyle where hikes like this are part of your regular routine, I’d love to help you find the perfect spot. Neighborhoods near Lake Mary, the Mammoth Lakes Basin, or even Old Mammoth offer fantastic access to trails like this one.
Ready to explore the Mammoth lifestyle firsthand? Reach out anytime. I’m always happy to share local trail intel, market insights, or help you discover why so many people never want to leave.
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Happy trails, Matthew Lehman Matthew Lehman Real Estate, Inc. CA Broker #01149776 homesmammoth.com
