Parking
No parking on the island. Arrive by authorized boat to Cuyler Harbor and join the ranger-led group from the beach/camp area.
Overview
About Caliche Forest Trail
This is San Miguel Island's showstopper: a ranger-guided, out-and-back walk from Cuyler Harbor Beach to the otherworldly Caliche Forest. Expect about 5 miles total (round-trip) over exposed, uneven terrain with strenuous climbing. Independent access is not allowed—hikes run only with a ranger because of the island's former bombing-range history and the risk of unexploded ordnance. You must stay with the group and remain on the designated trail.
Why go
- Unique fossilized tree and root casts you will not see elsewhere in the park
- Ranger interpretation adds rich geology and history context
Heads up
- Ranger-led only with permit/waiver; access is tightly controlled
- Fully exposed to wind and sun with no shade
- Strenuous sandy and caliche-hardpan footing
If you are into geology, paleobotany, or just love a truly singular landscape, absolutely. The hike is exposed and strenuous, but the Caliche Forest's surreal casts and the island's wild, remote feel make this one of the most distinctive hikes in the park. For a gentler day, consider staying closer to Cuyler Harbor's beaches and bluffs; the Caliche Forest route is the ranger-guided adventure with the genuine “nowhere-else” payoff.
Parkwolf’s verdictIs It Worth It?Map & elevation
The route
Loading the Channel Islands map
Full mapElevation3–823 ft
Plan your hike
Before you go
Parking
Best time to go
Safety
3 active Channel Islands alerts
- ClosureSanta Rosa Island wildfire-recovery closuresAvoid closed routes and shorelines on Santa Rosa Island during recovery from the 2026 wildfire.Official details
- ClosureSanta Barbara Island dock closed; landings restrictedThe Santa Barbara Island dock is closed; landings are restricted to the adjacent rocky ledge. - Severe winter storm damage caused the closure, and repairs are not expected in the near future.Official details
The highest, rockiest slopes around here are a summer buffet for grizzly bears.
Channel Islands Tour Guide
Your drive to Caliche Forest Trail, narrated.
Parkwolf is a GPS audio tour guide for Channel Islands National Park. As you drive, it chimes in with what’s ahead: hidden gems, upcoming stops, history, geology, and wildlife, right through your car’s speakers.
See the Channel Islands audio tourRecorded for this trailhead
The Ranger-Led Walk to the Caliche ForestListen
“You're about to start the main event on San Miguel, the ranger-led walk from Cuyler Harbor to the Caliche Forest. This guided trek is the only way to get from the beach into the island's interior.”
Plays as you drive up to this trailhead in the Parkwolf Channel Islands Tour Guide.
More stories near here in the app
- Cuyler Harbor: San Miguel's Wild Front Door
- San Miguel Island Campground: A Wild and Windy Stay
- Harris Point Trail and Coastal Bluffs
- The Unique Ghost Forest of Caliche
- 47 audio storiesacross Channel Islands’s roads, triggered by GPS as you drive
- Wildlife heatmapsfor Island Fox, Humpback Whale, Blue Whale, and 13 more
- Works offlinemaps, 31 trails, 49 places, and audio download before you lose signal
- CarPlay readysimple controls built for the drive
“Fantastic app with many points of information… It’s great to just turn on while you’re driving and it gives you an audio tour of the national Park. We love it!!!!”
Trail guide
Hiking Caliche Forest Trail
What You'll SeeThe payoff is a rare landscape of fossilized root and trunk casts—ghostly molds of ancient…
The payoff is a rare landscape of fossilized root and trunk casts—ghostly molds of ancient trees (likely pine and cypress) preserved in caliche and revealed by wind erosion. Some casts are impressively large, including a log-scale trunk cast more than 2.5 feet thick and 30 feet long. Underfoot, you'll cross caliche hardpan, sandy stretches, and windswept ridges with broad Pacific views. Keep an eye out for island foxes and seabirds; in spring, wildflowers dot the open slopes.
Geology & BackstoryDuring the last ice age, wind-blown sands buried living vegetation.
During the last ice age, wind-blown sands buried living vegetation. Over time, calcium carbonate from shell fragments leached through the soil, cementing sands into caliche and filling voids left by decayed roots and trunks—creating the hardened casts you see today. Later livestock grazing stripped protective topsoil, and relentless winds further exposed this “fossil forest.” It is one of the most unusual geologic sights in the park.
Logistics & RulesRanger-led only beyond the ranger station; do not attempt this route alone.
- Ranger-led only beyond the ranger station; do not attempt this route alone. You typically start after boats arrive at Cuyler Harbor. A permit/liability waiver and strict adherence to ranger instructions are required.
- Surfaces are sandy and sometimes slick on the hardpan; there is no shade and winds can be strong. Bring sturdy footwear, sun protection, and plenty of water—there is no drinking water on the island.
- No pets. Camping is limited to the designated campground near Cuyler Harbor, not on the trail.
Wildlife
Wildlife in Channel Islands
2,232 sightingsIsland FoxMost seen around 6 PMSighting map
282 sightingsHumpback WhaleMost seen around 9 AMSighting map
79 sightingsBlue WhaleMost seen around 7 AMSighting map
101 sightingsGrey WhaleMost seen around 8 AMSighting map
364 sightingsCalifornia Sea LionMost seen around noonSighting map
105 sightingsBald EagleMost seen around 5 PMSighting mapSighting maps show where each species has been reported across Channel Islands. Wildlife moves, so no sighting is guaranteed.
