Snow Canyon Lava Tubes
Two ancient lava tube caves accessible via the Lava Flow Trail in Snow Canyon State Park, formed ~20,000 years ago when molten basalt cooled on the outside while lava drained from within, leaving hollow subterranean passages you can climb into and explore.
This is one of the few places in the Southwest where you can descend into volcanic lava tubes without permits or technical gear. While Zion crowds pack the Narrows, you can have these cool, dark caverns nearly to yourself on a weekday morning — scrambling over black basalt in a red-rock canyon that feels like another planet.
From I-15 Northbound, take Exit 6 (Bluff Street). Head north on Bluff Street to Snow Canyon Parkway, turn left, and continue ~3.5 miles. Turn right onto Snow Canyon Drive into the park's south entrance. Drive 2.7 miles to the Butterfly Trailhead (or 3.1 miles to the Lava Flow Trailhead). From either trailhead, follow signs to the lava tubes — the south tube is 0.7 miles from Butterfly, the north tube is 0.4 miles from Lava Flow.
Know Before You Go
- 📵 Cell service: Expect limited or no signal. Download offline maps before you leave the trailhead.
- 🗺️ Access varies seasonally: Trail and road conditions shift with weather and snow. Verify current status with the local ranger district before you go.
- 📅 Last verified: Information current as of May 2026. Conditions change — always double-check locally before heading out.
Packing Checklist
- ☐ Sturdy hiking boots or trail shoes
- ☐ 1-2L water (no refill sources)
- ☐ Trail snacks / energy bars
- ☐ Sun protection (hat, sunscreen)
- ☐ First aid kit basics
- ☐ Map or downloaded trail (no cell service expected)
- ☐ Layers — mountain weather changes fast
Two volcanic caves sit along the Lava Flow Trail in Snow Canyon State Park, carved out roughly 20,000 years ago when a basalt flow crusted over on the surface while molten rock kept moving underneath. When the eruption stopped, the lava drained out and left hollow tubes running through the dark rock — and unlike most cave systems in the West, these require no permits, no reservations, and no technical gear to explore.
The south tube is the easier entry point. You’ll spot a step-like feature at the entrance — manageable with careful footing, and within a few yards a skylight opens overhead where the ceiling collapsed centuries ago. Head deeper and the ambient light fades to absolute darkness fast. The north tube is more committing: the main entrance drops in from an exposed ledge, and the alternate entrance requires an 8-foot downclimb through a narrow hole that filters out anyone not comfortable with a little scrambling. Both tubes branch inside, so bring a headlamp with fresh batteries and don’t go solo — cell phones don’t work underground.
The trail itself is 1.8 miles roundtrip from the Butterfly Trailhead, crossing open slickrock plains with views of the sandstone cliffs that give Snow Canyon its name. On the way back, take the short side trail up the small peak just south of the south tube (elevation 3,717) — the panorama of the canyon and surrounding desert is worth the extra 10 minutes. This hike gets dangerously hot in summer; March through May and October through November are ideal, with early mornings offering the coolest temps and the fewest people.
Verified Facts
- Located in Snow Canyon State Park, approximately 7 miles north of St. George (Source: Utah State Parks directions page, stateparks.utah.gov)
- Two distinct lava tubes along the Lava Flow Trail; south tube easier, north tube requires intermediate scrambling (Source: Road Trip Ryan, roadtripryan.com — includes GPS waypoints for both tubes)
- 2.6-mile out-and-back option available; 1,472 AllTrails reviews with 4.6 rating (Source: AllTrails)
- Formed by volcanic activity during the Pleistocene; part of the Santa Clara volcanic field (Source: Utah State Parks Lava Flow trail PDF)
- Park entry fee required; dogs allowed on leash; open year-round (Source: AllTrails + Utah State Parks)
Actionable Takeaways
- Arrive before 8 am on weekends — the Butterfly Trailhead has limited parking and fills up by 9 am in spring/fall
- Bring at least 2 light sources per person. Headlamps beat handheld flashlights for hands-free scrambling
- Visit the south tube first to gauge your comfort level before attempting the north tube’s trickier entrances
- Check the park entrance station for current conditions — tubes can be slippery for days after rain
Open Questions / Caveats
- Lava tube interiors are pitch black and disorienting — do not enter alone; state parks recommend groups of 3+
- Summer temps regularly exceed 100°F with zero shade on the approach trail; hike before 9 am or after 6 pm in June–September
- Graffiti and litter are recurring issues inside the north tube — pack a trash bag if you’re willing to help clean up (Road Trip Ryan users noted extensive glow stick debris as of October 2025)
- Cell service is nonexistent inside the tubes and spotty in lower canyon sections