Castle Geyser

Castle Geyser: a 12-ft geyserite cone erupts up to 90 ft from magma 5–13 km below.

Insider tip

Rainbow spray is most vivid in the morning light

Insider tip

The short 0.2-mile walk from Old Faithful is worth the view

The light

Alpenglow potential; sun angles enhance the spray at certain times

Heads up

Thermal hazard: extremely hot water and steam; keep a safe distance from the vent area. Gravity: Yellowstone terrain is uneven—stay on boardwalks. Chemistry: m…

Thermal Feature7,333 ftRestrooms availableNo permit neededGolden-hour pick

A white geyserite cone rises beside the boardwalk, steam lifting in the spray during eruptions. That cone forms from mineral-rich water that precipitates geyserite as it erupts, driven by magma 3–8 miles underground. The cone’s age is about 1,000 years, with the surrounding sinter shield dating around 10,000 years and terraces potentially forming over 200,000 years. Eruptions reach up to 90 feet and last about 20 minutes of water, followed by a 30–40 minute steam phase.

Getting there & parking

How To Get There: Park near Old Faithful; follow the Upper Geyser Basin boardwalks toward Castle Geyser for a short 0.2-mile stroll.
Distance From Entrance: 0.2 miles one-way from Old Faithful
Road Type: Paved park roads; viewing via maintained boardwalks
Parking Availability: Parking near Old Faithful; can fill quickly during peak times
Peak Fill Times: Parking capacity tends to fill quickly during peak seasons; plan to arrive early
GPS Coordinates: 44°27′48″N 110°50′12″W

When to go

Best Time To Visit: Accessible year-round; aim for golden hours when spray can create rainbows and crowds are lighter. Avoid midday glare and peak crowds by choosing early morning or late afternoon.
Best Visit Times: Early morning or late afternoon to minimize crowds and catch optimal light on spray
Sunrise Sunset Quality: Alpenglow potential; sun angles enhance the spray at certain times
Best Season: Year-round; shoulder seasons recommended for lighter crowds
Busiest Season: Summer (June–August)
Seasonal Access: Accessible year-round during park operating hours
Winter Access: Limited winter access; check park updates for road status
Weather Patterns: Possible afternoon thunderstorms; rapid weather shifts; wind direction influences spray visibility

What you will experience

Attraction Type: Thermal Feature
Main Features: Geyserite cone (~12 ft tall) with a ~3 ft orifice; large sinter shield; eruption height up to 90 ft; water phase ~20 min, steam ~30–40 min
What Youll See: A stark white cone formed by mineral deposits, with bursts of spray and steam; boardwalks encircle the feature and provide close viewing near Old Faithful
Unique Characteristics: One of Yellowstone’s largest ancient geyserite cones; sinter terraces beneath the cone may have formed over up to 200,000 years; among the park’s oldest active geysers
Photo Opportunities: Golden-hour spray halos; close-up of the cone with dramatic steam plumes; backlit eruptions from vantage points along the boardwalk
Photography Spots: East-facing vantage during sunrise for backlit spray; front-on shots along the main boardwalk loop
Best Viewpoints: Stand along the Castle Geyser circle on the Upper Geyser Basin boardwalks for frontal views of eruptions
Common Wildlife: Bison, elk; bears in the broader area; keep distance and follow bear-safety rules
Best Wildlife Times: Dawn and dusk when animals are most active
Geological Formation Type: Cone geyser
Scientific Interest: Ancient geyserite cone; large sinter shield; long-term formation of geyserite terraces; active hydrothermal system linked to shallow magma
Stargazing Quality: Excellent under dark skies when not crowded

Facilities, fees & access

Entry Fees: Varies
Permits Required: No
Restrooms Available: Yes
Restroom Type: Restrooms are available in the Old Faithful area.
Picnic Areas: No
Water Available: Yes
Cell Service: Spotty in the basin; plan offline maps
Interpretive Signs: Yes
Accessibility: Boardwalks with gentle slopes; some incline areas near viewing points
Accessibility Level: Drive-up view with boardwalk access; mostly accessible
Nearby Services: Old Faithful Village amenities; Old Faithful Visitor Education Center; restrooms; potable water spigots
Nearby Facilities: Old Faithful Visitor Education Center; restrooms; drinking water spigots
Family Friendly Notes: Keep children within arm’s reach near Castle Geyser. Stay on the boardwalks and the designated viewing paths, because the ground around the cone is hot and unstable and steam can be strong during eruptions. Wear sturdy shoes and supervise young visitors at all times.

Safety

Safety Considerations: Thermal hazard: extremely hot water and steam; keep a safe distance from the vent area. Gravity: Yellowstone terrain is uneven—stay on boardwalks. Chemistry: mineral-rich water can be corrosive; do not touch or ingest. Weather can shift quickly; dress in layers and protect against sun.

Nearby

Nearby Attractions: Old Faithful, Upper Geyser Basin, Old Faithful Inn
Connecting Trails: Boardwalk network connects Castle Geyser with Old Faithful viewing areas
Trailheads Here: Old Faithful – Castle Geyser link via Upper Geyser Basin boardwalks

Planning advice

Insider Tips: Rainbow spray is most vivid in the morning light
The short 0.2-mile walk from Old Faithful is worth the view
Check eruption timing but be prepared for variability
Do not touch the water or sinter surfaces
Tips Advice: Observe during golden hour for rainbow spray.
Stay on boardwalks; extremely hot water and steam in the vicinity.
From Old Faithful, the Castle Geyser walk is ~0.2 miles one-way.
Dress in layers; weather can change rapidly.

More details

Park Area: Upper Geyser Basin, Yellowstone National Park
Elevation Feet: 7333
Visitor Center Present: Yes
Guided Tours Available: No
Fishing Nearby: No
Swimming Allowed: No
Boating Allowed: No
Climbing Areas: No
Review Summary: Rated highly (4.9 stars from 176 reviews) for proximity and scale of the cone, with visitors appreciating the reliable eruption show and safe boardwalk viewing. Expect crowds during peak times but the short access from Old Faithful keeps the experience efficient.

Location

Photos

Castle Geyser erupts steam above a colorful hot spring in Yellowstone National Park's Norris area.

Castle Geyser at Yellowstone National Park displaying a blue mineral pool with steaming edges and colorful rim.

Castle Geyser erupts in Yellowstone National Park with steam plume rising as sunset lights the horizon.

Castle Geyser sits beside a calm river with geothermal steam rising from the surrounding barren area in Yellowstone National Park.

Frequently asked questions

Do I really need to arrive before 7am to get parking?

Parking at the Old Faithful area fills quickly in peak season; arriving early or using overflow lots improves chances of a hassle-free start.

Is it worth the 0.2-mile walk from Old Faithful?

Yes. A short stroll brings you to a monumental geyserite cone with an intimate view of eruptions and pouring spray.

Can I bring my kids to Castle Geyser?

Yes, but supervise closely on boardwalks; keep children away from thermal features and hold hands near the edges.

Is the water actually blue, or is that just in photos?

The water isn’t a vibrant blue; the scene gains color from lighting, spray, and mineral deposits during eruptions.

Will I see eruptions if I visit briefly?

Eruptions occur irregularly; plan for flexibility and check current park updates for eruption cues and viewing tips.

Grand Prismatic Spring

Rainbow rim of a hot spring; colors arise from thermophiles in Yellowstone's volcanic system.

Yellowstone Lake

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Lake Butte Overlook

Panoramic view of Yellowstone Lake from the caldera rim; distant Tetons on clear days.

Artist Point

Lower Falls overlook; canyon walls colored by hydrothermal alteration of rhyolite.

Gibbon River

84 ft Gibbon Falls; river through hydrothermal basins along Grand Loop Road.

Gibbon Falls

84-foot cascade over an ancient Yellowstone lava flow; drive-up overlook with a wheelchair-friendly path.

Sources

Editorial review: YourNPGuide Editorial Team. Information is compiled from official sources, verified traveler reviews, and editorial research; no firsthand visit is implied unless explicitly documented. Learn how YourNPGuide works.

Last updated January 2026. Report an issue.