Biscuit Basin

Overview

A compact, colorful hydrothermal basin a couple miles north of Old Faithful, Biscuit Basin packs a lot into a short loop: bright hot springs, frequent small geysers, and classic geyser-basin scenery along the Firehole River. When it’s open, it’s one of the most rewarding quick stops in the area—big on color, light on effort.

Highlights

• Sapphire Pool’s deep blue water and history steal the show.
• Jewel Geyser typically erupts every few minutes, perfect for quick visits.
• Mustard-toned springs and steaming vents make it a photographer favorite.

History & Geology

The name comes from biscuit-like sinter deposits that once ringed Sapphire Pool. After the 1959 Hebgen Lake earthquake, Sapphire erupted violently, blowing those “biscuits” away and reshaping the pool’s behavior. It eventually cleared and returned to its striking blue; its last eruption was in 1991. It’s a vivid reminder that Yellowstone’s hydrothermal system is always changing.

Current Status & Safety

On July 23, 2024, a hydrothermal explosion at Black Diamond Pool damaged portions of the boardwalk and prompted closures of the parking area, boardwalk, and nearby river access. Expect ongoing closures or reroutes and verify park alerts before you go. Obey all closure signs and stay on designated walkways when the area reopens—the ground here is thin and unstable.

Trails & Connections

The basin’s boardwalk loop is short (about 0.7 miles) and easy to follow. From the same area, you can branch out to Mystic Falls and connect with Fairy Creek and Summit Lake trails—great options if you want to turn a quick stop into a half-day.

Wildlife

Bears are reported in the vicinity. Carry bear spray, keep your distance, and never leave the boardwalk to approach animals.

Best Time to Visit

When open, aim for early morning or late afternoon for gentler crowds and easier parking; midday is busier in peak season. If closures persist, plan an alternate nearby stop like Black Sand Basin or the Old Faithful boardwalks.