Lone Star Geyser Trail
A backcountry geyser show at the end of a flat riverside trail
⏱ 2.5-4 hours👤 All ages$
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The wait is part of the experience. Lone Star's eruptions often build with smaller preliminary splashing before the main column, and the full event can last for a while, so arriving early in the window and settling on a log at a respectful distance is the way to see it. Bring snacks, water and patience; if you just miss an eruption, the next is a few hours away, and many families simply enjoy the river and the meadow while they wait. Kepler Cascades, beside the trailhead parking, is worth a quick look on the way in or out.
To hike well, carry bear spray and know how to use it, travel in a group and make noise, as grizzlies use this area. Stay on the trail near the geyser; the surrounding thermal ground is fragile and dangerous. In summer, mosquitoes can be thick near the river early in the season. In winter, check snow conditions and grooming status with the Old Faithful ski shop, start early to fit the short days, and carry layers, water and a headlamp.
Practicals and fit: trailhead just past the Kepler Cascades parking area south of Old Faithful; 4.8 miles round trip, mostly flat; bikes allowed on the paved section. Park entrance fee applies. Winter access is by over-snow travel to Old Faithful, with ski rentals available at the Old Faithful Snow Lodge. Fit: families, cyclists, geyser fans and winter skiers.
What to Expect
Format
A flat, partly paved 4.8-mile round-trip trail along the Firehole River to an isolated geyser cone that erupts up to 45 feet about every three hours.
Best Time
Summer and early autumn on foot or bike; winter on skis from mid-December when the over-snow season begins.
Duration
Two and a half to four hours, depending on the wait for an eruption.
Tips
Time your arrival for the eruption window and bring snacks for the wait. Carry bear spray. Dismount bikes at the end of the pavement. Check park alerts for Old Faithful-area closures.
⚡ Quick Picks
Best For
A geyser eruption with almost no crowd.
Families
Flat, bikeable and ending in a geyser show: ideal for kids.
Couples
A quiet riverside walk and a private-feeling eruption.
Pair With
Old Faithful and the Upper Geyser Basin.
Time Needed
Half a day from Old Faithful.
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Get Tickets →Frequently Asked Questions
How often does Lone Star Geyser erupt?
Roughly every three hours, reaching up to 45 feet from its 12-foot cone, according to the park.
Can I bike to Lone Star Geyser?
Yes, on the partly paved trail. Cyclists must dismount at the end of the asphalt and walk the last few hundred feet.
Can I visit in winter?
Yes, on skis, during the over-snow season from mid-December. You will need a snowcoach or snowmobile to reach Old Faithful first.
Is the trail difficult?
No. It is 4.8 miles round trip with little elevation change, suitable for most families.
Are there bears?
Grizzlies use the area. Carry bear spray, hike in a group and make noise, and check park alerts for closures near Old Faithful.
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