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Sisters Rocks Hike

From Oregon Hikers Field Guide

View of the three Sisters Rocks (bobcat)
Looking down on Frankport Beach (bobcat)
Gullet of the sea cave, Big Sister, Sisters Rocks (bobcat)
Middle and Big Sister from Frankport Beach (bobcat)
The walking route at Sisters Rocks (not a GPS track) (bobcat) Courtesy: Google Maps
  • Start point: Sisters Rocks South TrailheadRoad.JPG
  • End point: Sisters Sea Cave
  • Trail log:
  • Hike Type: In and out
  • Distance: 1.6 miles
  • Elevation gain: 260 feet
  • High Point: 210 feet
  • Difficulty: Easy
  • Seasons: All year
  • Family Friendly: Yes, in sections
  • Backpackable: No
  • Crowded: No


Hike Description

This picturesque headland came into the state system in 2009 through lottery dollars. The three stacks known as Sisters Rocks (One of them is offshore) dominate the landscape. In the largest of these stacks, the Sisters Sea Cave is a roiling cauldron fed by three entrance passages. The other point of interest is Frankport Beach. Frankport was once the site of a dock which uploaded tanoak bark from the area for transport to the S.H. Frank Tannery in Redwood City, California. The operation continued for about 12 years until 1905, and some rusting components lie scattered among the driftwood. Before the place was named Frankport, the sheltered cove had been a landing spot for eager prospectors in the 1850s and 1860s seeking their fortunes in gold from southern Oregon’s rivers. From the 1950s to the 1980s, the area was the site of a rock quarry.

The trail from the south parking area heads into a scrubby hillside of coyote brush, blackberry, Scots broom, cow parsnip, buckwheat, and lupine. Traverse the grassy slope, and make a left when you join the old quarry road. Get views north to Lookout Rock, Humbug Mountain, and Cape Blanco and south to the Devils Backbone and Nesika Point. The road reaches a low saddle. Head down to the right through a flat rocky bench where the quarry operations took place. Walk towards the Big Sister, and clamber up to the large opening to stare down into the Sisters Sea Cave. This was once an enclosed cave but the roof has since collapsed. Next, scramble around the base of Big Sister to your left, and climb up onto rocks to get a view of the cave’s mouths. The two lower mouths are right in front of you, while the third mouth, which waves explode through only at high tide, is hidden to the left. From here, you’ll also get a good look at the smallest sister offshore and Middle Sister looming above you to the left.

Return to the low saddle, and take the eroded road track or a trail down to Frankport Beach. A few rusting pieces of equipment lie scattered about behind the driftwood. When you reach the beach, walk past the high rock promontory to a secluded stretch of sand. There are rocks and stacks at the end of this beach. Look around for both red and green quartz-veined rhyolite. On the next little beach, a spectacular stack is joined to the mainland via a tombolo, or sand bridge. You can negotiate a jumble of rocks to reach one more tiny beach and then turn around.


Fees, Regulations, etc.

  • none

Trip Reports

Related Discussions / Q&A

Guidebooks that cover this hike

  • 100 Hikes/Travel Guide: Oregon Coast & Coast Range by William L. Sullivan

More Links


Oregon Hikers Field Guide is built as a collaborative effort by its user community. While we make every effort to fact-check, information found here should be considered anecdotal. You should cross-check against other references before planning a hike. Trail routing and conditions are subject to change. Please contact us if you notice errors on this page.

Hiking is a potentially risky activity, and the entire risk for users of this field guide is assumed by the user, and in no event shall Trailkeepers of Oregon be liable for any injury or damages suffered as a result of relying on content in this field guide. All content posted on the field guide becomes the property of Trailkeepers of Oregon, and may not be used without permission.