Porcelain Basin Trail

Porcelain Basin Trail is a 1.0-mile museum-to-museum loop through an open thermal basin. Most of the walk is boardwalk; the basin circuit itself maps to about 0.6 mile, with the short museum approach repeated on the return. Allow 45–60 minutes if you stop to look at the features. Published distances vary: one park description gives three-quarters of a mile, while the full mapped route here includes the approach and return. The separate eastern loop to Porcelain Springs Overlook makes a longer visit.

Start beside the Norris Museum and Porcelain Basin Overlook, then head north to the basin circuit. The route drops beside Ledge Geyser into the pale basin, passes Sunday Geyser, Constant, Whirligig and Pinwheel geysers, then Crackling Lake, and returns toward Ledge before climbing back to the museum. Expect a steep, uneven descent at the start and a mix of boardwalk, paved path and bare ground. The basin floor is exposed, with little shade.

Norris sits near the meeting of three major faults, and its hydrothermal system shifts with changes in water and seismic activity. Pools can cloud over and geysers change their behavior, so the named features may look different from one visit to the next. The hottest temperature recorded at Yellowstone, 459°F, came from a scientific drill hole more than 1,000 feet below the surface; it is not a surface reading from the trail.

The pale basin is coated with silica and clay. Orange runoff gets color from cyanobacteria; warm acidic water can support bright green Cyanidium algae, while cooler patches may hold dark mats of Zygogonium. Look for the transitions along runoff channels rather than expecting every pool to keep the same color.

From the overlook, frame the boardwalk curves against the pale basin to show the scale of the thermal flats. On the loop, look back toward Ledge Geyser for its steam plume when it is active. The Porcelain Springs Overlook on the optional eastern loop has a separate view across blue pools toward the Gallatin Mountains.

The Norris Museum beside the start is one of Yellowstone’s original trailside museums, built in 1929–30 and now a National Historic Landmark. Park in the Norris Geyser Basin lot at Grand Loop Road and Norris Canyon Road; no separate trail permit or reservation is required, though the park entrance fee applies. The listed hiking season is spring through fall; in winter Norris is accessible only by snowmobile. Pets are not allowed on thermal-area boardwalks or trails. Stay on marked paths: some pools are above boiling temperature, and the ground beside them is unsafe.