Blue Glacier

Overview

Blue Glacier is the showpiece ice on the north side of Mount Olympus, a remote backcountry objective reached via the Hoh River Trail. It’s a rewarding, commit-and-earn-it kind of trip: ancient rainforest, wildflower meadows, and finally a high-alpine amphitheater of blue ice, crevasses, and seracs.

What Makes It Special

• Scale and motion: roughly 1.7 square miles in area, 2.6–2.7 miles long, and up to 900 feet thick, with the fastest sections moving about 3 feet per day.
• Textbook glaciology: two accumulation zones (including Snow Dome) feed the lower valley glacier, separated by icefalls; you’ll see crevasses, icefalls, and a terminal moraine.
• Big-picture importance: it feeds the Hoh River, sustaining rainforest ecosystems and cold-water fish like salmon and bull trout. The glacier is retreating and thinning—an on-the-ground window into climate change.

The Approach and Views

The journey starts in the moss-draped Hoh Rainforest and gradually climbs into open alpine terrain. Classic views are from the lateral moraine, where the glacier’s blue tint and fractured surface are on full display and Mount Olympus looms above. Highlights along the way include the Hoh’s milky glacial water, old-growth giants, and wildflower meadows.

Route, Effort, and Hazards

• Distance and gain: plan on 35–40 miles round trip with roughly 6,000 feet of elevation gain, typically done in 2–4 days.
• Notable obstacles: the Jemrod Gully Ladder (a long cable-and-rung descent of a sandy slope) requires care, especially when wet or icy.
• Conditions: weather shifts fast; rain, fog, and even summer snow are possible. The final miles are rugged and exposed in places.

Wildlife

Elk, deer, black bears, and marmots are commonly reported, with occasional mountain goats higher up. Jays, woodpeckers, and raptors patrol the forest and ridgelines. In the river below, salmon and trout ride the glacier’s meltwater.

Best Time to Visit

Summer through early fall offers the safest travel after high snow melts. Crowds thin dramatically the farther you go from the Hoh trailhead; the upper basin is often quiet despite the Hoh’s popularity.

Logistics You Need to Know

• Access: There is no road to the glacier. The trailhead and parking are at the Hoh Rain Forest Visitor Center; the glacier is roughly 17.5 miles one way.
• Camping and permits: Wilderness camping requires a park permit. Many parties stage at Elk Lake, about 2 miles below the glacier, or rest at the Olympus Guard Station lower down.
• Amenities: None at the glacier—no restrooms, water stations, stores, or shelter. Treat all water from streams. Bear canisters are required.

Science and Context

Blue Glacier sits only about 55 km from the Pacific—unusual for a large North American glacier—and has a long history of scientific monitoring. Its ongoing retreat mirrors broader trends across the Olympics, making it both a scenic destination and a living research site.