Seven Mile Hole Trail

Overview

Seven Mile Hole is Yellowstone’s classic rim‑to‑river trek: about 10 miles total, out-and-back, and frankly strenuous. You’ll earn rare access to the bottom of the Grand Canyon of the Yellowstone, trading crowds for solitude, river time, and a close look at hydrothermal features painting the canyon walls.

Route Experience

Start at the Glacial Boulder pullout near Inspiration Point. The opening 1–1.5 miles cruise the canyon rim with knockout vistas, including a look across at Silver Cord Cascade—the park’s tallest cascade with a rope‑thin, thousand‑foot drop. This is also where some hikers get a unique full view of Crystal Cascade from the rim.

Beyond the rim, the trail heads into lodgepole forest, passes a signed junction (Mount Washburn Spur goes left; Seven Mile Hole continues right), and then the character changes. Over roughly the final 2 miles to the river, the path drops steeply—more than 1,000 feet—on loose gravel and rocky switchbacks through an area of dormant and active hot springs. Footing can be sketchy near thermal ground; stay on durable tread. At the bottom, the Yellowstone River and the confluence with Sulphur Creek make a fine lunch spot and turnaround. Backcountry campsites exist down here (permits required), and anglers sometimes target native cutthroat (permits/regs apply).

Geology and Highlights

This hike reads like a field trip in canyon geology. Hydrothermal waters have altered the underlying rhyolite lava, creating those vivid yellows and reds that give the canyon its name. You’ll encounter vents, steaming areas, and mineral-stained soils on the descent—keep your eyes open and your feet on the established path. A short side trip from the junction leads toward Washburn Hot Springs (acidic mud pots historically dubbed “Hell‑Broth Springs”) if you want to peek into another thermal tableau; add time and energy accordingly.

Difficulty, Timing, and Strategy

Expect a moderate approach, then a punishing descent and an even tougher climb out. Many hikers report roughly 2 hours down and 3 hours back up, depending on fitness and heat. The final miles are steep, loose, and can feel exposed. Trekking poles and grippy footwear help enormously. There’s no water on the route except the river—bring plenty and filter/treat if you refill. No facilities; pack out all trash. This is bear country—carry bear spray, hike in a tight group, and make noise. Start early to beat heat on the ascent and to improve your odds of solitude and wildlife sightings.

Best Time to Hike

Late spring through fall, weather permitting, is the typical season. Early starts are key—shade is limited near the canyon bottom, and the climb bakes on warm days. Weekdays see fewer people. Early summer can bring lingering patches of snow on higher connectors in the broader area, but the main draw here is the rim-to-river segment; check current park advisories before you go.

Who Will Love It (and a Great Partial Option)

If you want a quieter, hard-earned canyon experience, this is your hike. If you’re on the fence about the effort, do the first 1–1.5 miles along the rim for big views and the waterfall vantage, then turn around—an excellent, easier sampler without the brutal climb.