Volcanoes, Lava Tubes & Desert Oddities

Pahvant Butte rising out of the Sevier Desert Pahvant Butte, the volcanic crater that anchors this loop. Photo via Wikimedia Commons.

This is the itinerary for people who've done Zion and Bryce and want something almost nobody else is doing. Central Utah's volcanic field west of Fillmore gets a fraction of the visitors of the national parks, and it delivers a genuine "how did I not know about this" moment: a volcano you can drive into, and a lava tube system you need a flashlight to explore.

Quick Facts
Trip Length 2-3 days
Rig Suitability Vans, trucks, and most trailers
Overnight Stops 2 (3 with the House Range extension)
Regions Covered Central Utah
Best Season Spring and fall
Road Conditions Graded dirt with a rougher final stretch at each stop; impassable clay when wet

Map

Map points are approximate waypoints meant to show the shape of the route. Use the individual spot write-ups linked below for precise access directions.

The route

Night 1 — Pahvant Butte Pahvant Butte, also called Sugarloaf Mountain, is a tuff cone volcano that erupted underwater into ancient Lake Bonneville roughly 15,000 years ago. A rough dirt track climbs right into the crater, where the concrete pylons of a failed 1922 wind-generator project still sit at the rim. Camp on the surrounding BLM desert — see the full write-up for access notes. High clearance helps on the final stretch of the access road, and don't attempt it wet.

Daytime stop — Fillmore/Meadow lava tubes (Tabernacle Hill)

Black Rock Desert volcanic field, the lava field around Tabernacle Hill The Black Rock Desert volcanic field surrounding Tabernacle Hill. Photo via Wikimedia Commons.

A lava field riddled with collapsed tunnels and pits from an eruption roughly 10,000 to 24,000 years ago. Several of the tubes are long, genuinely dark, and floored with jagged boulders — bring a real flashlight or headlamp, not just a phone light. The access road off the Meadow exit (I-15 exit 158) is graded dirt with a rougher final stretch; most crossovers and trucks handle it fine in dry weather.

Night 2 (optional extension) — House Range & Notch Peak If you have an extra day and a high-clearance rig, push west toward the House Range for one of the most dramatic and remote landscapes in the state: Notch Peak's west face drops more than 2,500 feet, one of the tallest limestone cliffs in the country. This is true backcountry — no cell service, no water, and roads that turn to slick clay when wet. Not for trailers; high-clearance trucks and vans only.

Good to know

  • Bring a real flashlight for the lava tubes. This isn't optional — several sections are genuinely dark with uneven, rocky footing.
  • Check the forecast before you go. Both the crater road and the House Range extension cross clay soils that become impassable when wet.
  • Fuel up in Fillmore or Delta. Services thin out fast once you're off I-15.
  • Full write-up available: this loop overlaps with the Central Utah stretch of our Southern Utah Backcountry Loop trip report, which covers it in more depth alongside a longer multi-day route.

A weekend chasing volcanoes through the desert is a good shakedown trip for a new power setup before a longer haul. See what an off-grid power system looks like