Excelsior Geyser

Overview

Excelsior Geyser Crater is the dramatic, blue-tinted centerpiece you reach first on the Midway Geyser Basin boardwalk. Once among Yellowstone’s most explosive geysers, it now behaves as a massive hot spring that continuously discharges roughly 4,000–4,500 gallons of near‑boiling water per minute into the Firehole River. Expect a constant roar and thick steam that ebbs and swirls with every breeze.

What You’ll See

• A huge crater, about 200 by 300 feet, filled with intensely blue, vigorously boiling water and heavy steam.
• Powerful outflow carving colorful runoff channels as it rushes into the Firehole River.
• An easy “two‑for‑one” stop with Grand Prismatic Spring on the same boardwalk loop.

History & Geology

In the late 1800s, Excelsior hurled water and steam 100–300+ feet high, sometimes shaking the ground and flinging rocks while briefly boosting the Firehole’s flow. After that violent period likely damaged its underground plumbing, it went quiet by around 1890. A short resurgence in September 1985 sent bursts 30–80 feet high for about two days. Since then, it’s been a vigorous hot spring with occasional bouts of strong boiling.

Getting There & On‑Site Basics

The feature sits directly on the Midway Geyser Basin boardwalk; it’s the first big pool you encounter from the parking lot. Vault toilets are available at the lot, and the boardwalk guides you past Excelsior to Grand Prismatic.

Photography & Viewing Tips

Steam is the wildcard. If the crater is fogged in, give it a few minutes—shifts in wind often reveal striking windows into the pool. Cooler, calmer weather generally means more steam; breezier stretches help clear the view.

Best Time to Visit

Crowds and parking are the limiting factors here. Aim for early morning or late afternoon/evening to avoid peak congestion. Visit when there’s at least a light breeze for the best visibility into the crater.

Bottom Line

Excelsior isn’t erupting these days, but the scale, sound, and constant outflow make it a memorable stop—especially paired with Grand Prismatic just up the boardwalk.