The Hoh Rain Forest: Where Trees Grow on Fallen Trees
I pulled off Highway 101 near Forks and drove the Upper Hoh Road to where it ends at the trailhead. Then I stepped into the Hoh Rain Forest, and the light changed. It comes down green here, filtered through so many layers of leaf and moss that even a bright afternoon feels a little like being underwater.
I came for the Hall of Mosses Trail, a short loop — just eight-tenths of a mile — that folds you into old-growth forest fast. What holds you there is harder to leave behind.
A rain forest, literally
The Hoh is a temperate rain forest, and the "rain" is not an exaggeration. Olympic's rain forest valleys receive between 140 and 167 inches of precipitation a year — twelve to fourteen feet of water. That much moisture, paired with mild temperatures that rarely freeze and summers that seldom top 80°F, builds something you don't find in many other places. Forests like this once ran nearly unbroken from southern Oregon to southeast Alaska; today little survives outside protected land, which makes the Hoh one of the most intact examples left in the lower 48.
Sitka spruce and western hemlock dominate the canopy, some reaching 250 feet and standing for centuries. But the detail I always point out to students is what's growing on the trees. Mosses, spike mosses, ferns, and lichens drape nearly every trunk and branch. These are epiphytes — plants that perch on other plants for a place to sit, not to steal from them. They aren't parasites; they're just making a living on the surplus of light and moisture up in the crowns.
Nurse logs
Then there are the nurse logs, my favorite lesson in the whole forest. When a giant falls and begins to rot, its soft, wet body becomes a seedbed. New seedlings germinate along the log, sending roots down its sides toward the soil. Decades later the log has decomposed entirely — but the young trees remain, lined up in a row on arched, stilt-like roots where the log used to be. The Park Service calls that a colonnade. It's one generation feeding the next, drawn in a straight line you can walk beside.
The elk that shape the forest
I didn't see elk on the trail that day, but their work is everywhere. Olympic protects the largest fully wild herd of Roosevelt elk in the Pacific Northwest — the largest variety of elk in North America, with bulls up to 1,100 pounds. They graze the ferns and shrubs of the understory, and in doing so they help shape what grows there. It's part of why Theodore Roosevelt set aside this habitat as a national monument in 1909; the elk still carry his name.
I stood a while where the moss hangs lowest and just listened to it drip. Some wild places dazzle you. The Hoh does something quieter — it teaches you patience, one nurse log at a time.
Planning a park road trip with kids?
Long drives are part of every national park trip. I made the Screen-Free Road Trip Kit to turn the miles into part of the adventure: 35+ printable pages of road trip bingo, nature scavenger hunts, a Roadside Science Spotter, sketch prompts, and trip reflection pages for curious kids ages 7–12. Print it, pack it, and go.
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