Mud Volcano

Q: Is it worth the 0.6–0.85 mile loop to see Mud Volcano and Dragon's Mouth Spring?

Yes. The short loop exposes bubbling mudpots, steaming vents, and the dramatic Dragon's Mouth Spring; the boardwalks keep you safe while you observe the chemistry in action.

Q: Can I walk off the boardwalk to get closer to the mud?

No. Leaving the boardwalk endangers you and damages the delicate hydrothermal ground; stay on the designated paths.

Q: Will I see bears or bison here?

Bison are common around Mud Volcano; maintain 25 yards from all wildlife, and 100 yards from bears and wolves.

Q: Is there potable water nearby?

Potable water spigots aren’t noted at Mud Volcano; bring water from elsewhere in the park.

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Overview

About This Attraction

Mud boils and steam hiss along the boardwalk. Sulfur Caldron and Dragon's Mouth Spring vent steam and mud, while the air carries a rotten-egg scent. This hydrothermal patch sits in the Yellowstone Caldera near a resurgent dome—ground deformation is ongoing. Magma heats groundwater, creating acidic chemistry that dissolves rock into the clay-rich mud that churns beneath pressure.

Best Time to Visit

Spring through fall when the main park road is open. Morning light highlights the steam and mud; avoid midday glare. To dodge crowds in peak summer, arrive before 9am or after 3:30pm.

Visitor Tips

Stay on the boardwalks at all times; the ground is hot and chemically aggressive.
Carry water; no potable water spigots are noted here.
Bison are common—keep 25 yards from all wildlife, 100 yards from bears and wolves.
The sulfur smell can irritate sensitive visitors; masks help.
Bear spray advisable when moving beyond the immediate boardwalk zones; cell service is unreliable.

Details

Location & Features

GPS: Varies

Nearby

Nearby Attractions:

Dragon's Mouth Spring; Sulfur Caldron; Hayden Valley; Fishing Bridge

Insider Tips

Arrive before 9am or after 3:30pm to beat crowds
Keep to the boardwalk; ground is hot and chemically aggressive
Bison are common—give space; carry bear spray if venturing beyond the boardwalk
Dragon's Mouth Spring is accessible via a short spur; the sulfur smell can be strong
Dawn and dusk offer dramatic lighting and wildlife activity

Visitor Information

Accessibility:

Lower loop wheelchair accessible; northern sections paved but steep; stairs at northern end

Family Friendly:

Boardwalks keep kids safe; be mindful of hot ground and sulfur vents

Nearby Facilities:

Parking lot; vault toilets; interpretive signs

Reviews

★★★★☆

4.7 /5

Based on 2066 Google reviews

Reviews from Google

Easy parking, easy boardwalk hike about two hours to finish the whole trail. Different shapes, colors and steam levels of geysers. The sulfur smell can be irritating for sensitive people, better wearing masks.

One of our first stops on our week long trip. The ranger was there to ensure no one went near the buffalo. Was very happy and excited to capture this moment. Highly recommend every family who is able to visit Yellowstone at least once.

This area was beyond fascinating! The immense amount of power being exerted throughout this hit spot was mind boggling. I honestly couldn't get over the fact that literally every pathway seemed to be lined with small and large mud pots alike, and the fumaroles were screeching against the hillside all the while. As we reached the peak of the hilltop, we witnessed a Bison taking a nap against one of the muddy pools, and then almost crossed paths with a small herd making their way down the hill towards the parking lot.

Showing 3 of 2066 reviews

FAQs

Do I really need to arrive before 9am to get parking?

Yes. The Mud Volcano lot holds ~70 spots and fills quickly in peak season; arriving before 9am or after 3:30pm helps secure a space.

Is it worth the 0.6–0.85 mile loop to see Mud Volcano and Dragon's Mouth Spring?

Can I walk off the boardwalk to get closer to the mud?

Will I see bears or bison here?

Is there potable water nearby?

📖 nps.gov 📖 wikipedia.org 📖 yellowstone.org 📖 yellowstonenationalpark.com 📖 nationalparked.com 📖 hikespeak.com 📖 justgotravelstudios.com 📖 hikeramerica.com 📖 youtube.com 📖 wanderlog.com 📖 yellowstoneinsider.com 📖 10adventures.com ⭐ Google Reviews 📝 YourNPGuide Editorial

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