Delta Lake

Overview

Delta Lake is a striking alpine tarn tucked into Glacier Gulch, framed dramatically beneath the Grand Teton. Its unreal turquoise color comes from fine glacial silt (rock flour) suspended in the water, fed by the Teton Glacier above. It’s one of the most photogenic spots in the range—and also one of the most earned.

Route & Difficulty

Start at Lupine Meadows and follow the maintained Surprise/Amphitheater Lakes Trail through about six switchbacks. From there, an unofficial, unmaintained user path climbs steeply via loose dirt “steps,” down-and-up transitions, and a boulder field to the shore. Plan on roughly 7.4–8+ miles round-trip with about 2,200–2,300 feet of gain. Expect a strenuous day with careful footing needed in the final half-mile, especially through the talus.

What You’ll See

The payoff is huge: a vivid turquoise lake ringed by talus with the high Teton spires looming overhead—classic, close-up views of the mountain you came to see. Below the lake sits Glacier Falls (intermittent), and you’ll pass subalpine forest and seasonal wildflowers on the way up.

Wildlife

This is prime bear country—both black and grizzly bears frequent the area—so carry bear spray and know how to use it. Marmots, pikas, deer, and birds are common; an occasional moose may wander through the gulch. Give wildlife space and stay alert on the switchbacks and in brushy stretches.

Best Time to Visit

Start early. You’ll beat crowds, grab a parking spot at Lupine Meadows, and dodge typical afternoon thunderstorms. Weekdays are calmer than peak-season weekends. Early summer can still hold snow and ice on the upper route, making navigation and footing trickier; late summer to early fall tends to be more straightforward, with fewer storms as the season winds down.

What to Know

• The final approach is unmaintained and involves route-finding and boulder hopping—download offline maps and don’t blindly follow strangers.
• The terrain is steep and loose in places; rockfall and twisted ankles are real risks. Trekking poles and solid boots help a lot.
• The water is glacially cold year-round; swimming is not recommended due to cold shock/hypothermia risk.
• There are no amenities at the lake—no restrooms, tables, or water taps—so plan and pack accordingly.

Quick Logistics

• Trailhead: Lupine Meadows
• Distance/Elevation: ~7.4–8+ miles RT; ~2,200–2,300 ft gain
• Time: Commonly a half to full day, depending on pace and time at the lake

If you’re up for the effort and prepared for rugged terrain, Delta Lake is absolutely worth your time—one of the park’s most rewarding day hikes.