Moderate Dog Hikes in Mammoth Lakes (2026 Trail Guide)

The moderate hikes are where Mammoth's trail system really shines for dogs. You get genuine elevation gain and dramatic scenery without the full-day commitment of a strenuous alpine push. These routes give you the full Mammoth experience: multiple lakes, real granite terrain, views, and the satisfying tiredness that means your dog will sleep straight through until morning.

Quick Answer: Moderate Dog Hikes

Sherwin Lakes — The Best Moderate Hike for Dogs in Mammoth

Distance: 5 miles round trip.
Elevation gain: 1,000 feet.
Trailhead: Sherwin Lakes Trailhead on Old Mammoth Road. Starting altitude: 8,000 feet.

Sherwin Lakes is my top moderate recommendation for dog hikers. The trail climbs steadily through pine and fir forest before breaking into open granite country and a series of three small alpine lakes. Each lake has swimming access. The trailhead is on Old Mammoth Road — less crowded than the Lake Mary Road trails. Apply Musher's Secret Paw Wax [AMAZON-LINK] at the trailhead for the upper rocky sections.

Crystal Lake Trail — Best Views per Foot

Distance: 3.4 miles round trip.
Elevation gain: 1,000 feet. Trailhead:
Lake George parking area at the end of Lake Mary Road. Starting altitude: 9,000 feet.

Crystal Lake sits in one of the most dramatic granite cirques near Mammoth. The trail is a consistent climb with good tree cover for the first half and open terrain near the top. Dogs do well on this trail — long enough to be a real workout but short enough not to exhaust them. Ruffwear Bark'n Boots [REI-LINK] are worth using here if you're doing multiple consecutive days.

Barrett Lake — Best for Dogs Who Want Solitude

Distance: 2 mile round trip.
Elevation gain: 900 feet.
Trailhead: Lake George parking area (different fork from Crystal Lake. Walk though the campground to the outlet of Lake George, cross the stream and hike up!). 
Starting altitude: 9,000 feet.

Barrett Lake sits above Lake George and gets a fraction of Crystal Lake's visitors. The trail involves some genuine rocky scrambling near the top — this is where the Ruffwear Web Master Harness back handle is useful for lifting dogs over specific boulder sections. The lake is small and cold, nestled in a granite bowl with excellent views east toward the White Mountains.

TJ Lake — Best Short Moderate

Distance: 1.5 miles round trip.
Elevation gain: 400 feet.
Trailhead: Lake George parking area.

TJ Lake is a small but beautiful alpine lake just above Lake George — the shortest trail with genuine elevation gain in the Lakes Basin. Good option when you want the feel of a mountain hike without a full-day commitment. Often combined with a circuit of Lake George itself for a half-day outing.

Frequently Asked Questions

Which moderate trail is best for a dog's first real hike at Mammoth altitude?

Sherwin Lakes is the best moderate hike for a dog that has spent one day acclimatizing. It starts at a lower elevation than the Lake George trailheads (8,000 feet vs 9,000 feet), giving the dog more gradual elevation gain. The multiple lakes also allow natural rest and hydration stops throughout.

Is the Barrett Lake trail appropriate for all dogs?

Not quite. The rocky scrambling sections require a dog with reasonable athletic ability and confident footing. Small dogs and any dog with joint issues may struggle with the boulder sections. Crystal Lake and Sherwin Lakes are safer moderate choices for dogs with physical limitations.

How early should I start moderate hikes in summer?

Start by 7–8 AM. This gives you cooler morning temperatures for the uphill sections, gets you to the lake during the best part of the day, and has you descending before the afternoon thunderstorm window (typically 1–3 PM).

Affiliate disclosure: This post contains affiliate links. I earn a small commission on qualifying purchases at no extra cost to you. I only recommend gear my dogs and I personally use on these trails.