Delta Lake Trail

Overview

Delta Lake is the showstopper alpine tarn tucked beneath the Grand Teton—icy turquoise water in a glacial cirque, ringed by cliffs and boulder fields. The hike is an out-and-back of roughly 7.5–8.1 miles total with about 2,200–2,300 feet of gain. It starts mellow on a maintained trail, then turns into an unofficial, unmarked user route that demands hands-on scrambling and solid route-finding. If you want a paved, signed stroll, this isn’t it. If you crave dramatic scenery and don’t mind working for it, you’ll be grinning at the shore.

Route Snapshot

Begin at Lupine Meadows Trailhead and follow the signed path toward Surprise/Amphitheater Lakes. After a series of sustained switchbacks (watch for the landmark of six completed switchbacks), an unmarked use path drops down a set of dirt “steps” toward Delta Lake. From here, expect rough tread, steep dirt, roots, and multiple boulder-field crossings. At the second boulder field, stay right and aim for the trees on the far side—that line leads correctly toward the lake. The final approach is a hands-and-feet scramble over large blocks before you pop into the cirque and that unreal turquoise shoreline.

Difficulty & What It Feels Like

Overall, this is a hard hike: big vertical, uneven footing, and an unmaintained, unmarked spur that’s easy to lose—especially when snow lingers or if you simply follow the wrong group. The maintained portion is moderate; the last mile is where the work (and fun) happens. Sturdy boots matter. So does patience—expect to slow down through talus and to confirm you’re on track at unmarked junctions.

Scenery, Geology, and What to Watch For

Delta Lake is a classic glacial tarn. Fine glacial silt suspended in the water gives it that signature turquoise glow, particularly striking on calm, sunlit mornings. The approach moves through shady forest and summer wildflowers, then into rugged glacial terrain with sweeping views of the Teton spires. Keep an eye out for bear sign—both grizzly and black bears use this area—along with alpine birdlife near the cirque.

Best Time to Hike

Prime season is late June through September when the route is typically snow-free and the boulders are less icy. Sunrise starts are gold here: cooler temps, more reliable parking, and the best light on the cirque. Early and late season can bring snowfields and slick rocks that magnify the route-finding challenge—plan conservatively if you’re going on the edges of summer.

Tips & Logistics

• Parking fills very early at Lupine Meadows in peak season—arrive at or before sunrise. The access road is gravel but generally well maintained.
• Bring a downloaded map or track and don’t blindly follow crowds; many parties drift off-route in the boulders.
• Bear spray is strongly recommended. Pack layers for fast-changing mountain weather, plus plenty of water and calories—there are no reliable on-trail water sources.
• No dogs on this trail. A park entry pass is required for access.

If You Want a Fully Maintained Alternative

Stick with the signed Surprise and Amphitheater Lakes Trail for a great day on official tread with big views and alpine lakes—less scrambling, more certainty. Delta is the wilder option; choose based on your comfort with unmaintained terrain.