Biscuit Basin Boardwalk

Overview

This is a quick, lollipop-style boardwalk loop through one of the park’s most colorful hydrothermal pockets. In roughly 0.6 miles total, you’ll pass bright hot springs and small geysers—Sapphire Pool, Black Opal Pool, Mustard Spring, Avoca Spring, and more. Jewel Geyser steals the show with frequent spurts every 7–10 minutes. Plan about 15–30 minutes if you linger for eruptions and photos.

Current status and safety

A hydrothermal explosion at Black Diamond Pool on July 23, 2024, blasted a 400–600 ft plume and damaged sections of the boardwalk. The area has had additional small eruptions since, and the loop has been closed while hazards are assessed. Expect conditions to change; when it reopens, follow posted guidance. In all hydrothermal areas: stay on the boardwalk, supervise kids, and never touch or toss anything into features—the crust is thin, the water is scalding, and the ground can give way.

Route and highlights

From the signed parking area, the spur leads to a loop weaving past vividly blue pools rimmed by colorful microbial mats. Sapphire Pool is the star—this basin was named for the biscuit-like sinter that used to ring it. You’ll also see small but lively features like Jewel Geyser. From the far side of the loop, trails connect toward Mystic Falls, Observation Point, Summit Lake, and Fairy Creek when area trails are open. There’s also a popular connection toward Morning Glory Pool from this trailhead when conditions and closures allow.

Accessibility

The boardwalk is mostly level and wide, with gentle grades, and includes a wheelchair-accessible overlook at Wall Pool. Note that during closures, accessible features in the basin may be unavailable.

Logistics

Distance is about 0.6 miles total for the loop (plus a short connector from the lot). The trailhead sits along Grand Loop Road, about 2.5 miles north of Old Faithful or 14 miles south of Madison Junction. It’s typically less crowded than the immediate Old Faithful area, but the lot can still fill—arrive early.

Best time to visit

When open, mornings bring softer light on the pools and easier parking. Midday can be bright and contrasty for photography but often rewards with frequent small eruptions at Jewel Geyser. Shoulder seasons can be great for thinner crowds if conditions allow access. In any season, closures can pop up quickly here due to ongoing hydrothermal activity—always verify status before you go.

Who it’s for

If you want a short, high-payoff stroll through classic Yellowstone hydrothermal scenery, this boardwalk is a great pick. When closures persist, similar color-and-steam vibes await at other basins along the same corridor, which can serve as stand-ins until Biscuit Basin reopens.