Tide Pools in Marin: The Best Spots and When to Go

The best tide pools in Marin are at Duxbury Reef in Bolinas and Sculptured Beach in Point Reyes National Seashore, and the time to go is a minus tide, when the water drops below zero on the tide chart. Get there an hour before the low and plan to leave within an hour after the water turns.

Marin’s outer coast faces open ocean, so the tide decides almost everything. A low of a foot or two above zero leaves much of the reef under water. A minus tide uncovers rock that stays submerged on most other days of the month.

When to Go Tidepooling in Marin

Aim for a minus low tide in daylight. The National Park Service says the best time is a minus low and that not every low tide drops far enough. Plan to arrive at least an hour before low tide and leave no later than an hour after the tide begins to rise.

The season changes the time of day. NOAA predictions for Point Reyes show the lowest tides of late spring and summer falling from before dawn into the morning. From late fall through winter they shift to the afternoon and evening, and in November and December many of them come close to sunset.

Read more on minus tides and how to read a tide chart.

Next Daylight Minus Tides

Low tides below zero between sunrise and sunset in the next 90 days.

Duxbury Reef and Agate Beach

Duxbury Reef sits just west of Bolinas, below Agate Beach County Park at the end of Elm Road. It is one of the largest shale reefs in North America, and the Park Service calls it the most extensive tidepool area near Point Reyes National Seashore. It also has the gentlest return of the high tide, which makes it the easiest place in Marin to explore with kids.

A short, steep dirt trail drops from the parking lot to the beach. Turn left on the sand to reach the main reef. Marin County Parks opens the park from sunrise to sunset and asks visitors to come at low tide when the surf is calm.

Check Duxbury Reef tides and Agate Beach tides before you go.

Sculptured Beach and Point Reyes

The Park Service says the best and safest tide pools inside Point Reyes National Seashore are at Sculptured Beach, south of Coast Campground. The shortest walk starts at the Limantour Beach parking lots. Walk to the beach, turn left (south) and go about two miles.

Sculptured Beach is fairly sheltered and good for children, but it has one catch. The Park Service says not to go past the rocks if the tide is coming in, because at high tide there is no way out. See Limantour Beach tides for timing.

Farther north, the south end of McClures Beach has good pools at the lowest tides. The Park Service says to explore it only at low or outgoing tide, because visitors have been trapped there by the incoming tide and some have died. The Point Reyes tides cover McClures and the beaches along the outer coast.

Muir Beach

Muir Beach is a sheltered cove in Golden Gate National Recreation Area, and the rocks along its edges hold small pools at low tide. It is the closest of these spots to Mill Valley and the Golden Gate Bridge. It is a small area compared with Duxbury, and the surf here can be rough, with no lifeguards on duty.

Tidepool Spots Compared

Spot	Best for	Watch out for
Duxbury Reef (Agate Beach)	The largest reef, families, a slow rising tide	Short, steep path to the beach
Sculptured Beach	A sheltered reef at Point Reyes	Four-mile round trip walk, cut off at high tide
McClures Beach	Wild pools at the lowest tides	Sneaker waves, cut off by the incoming tide
Muir Beach	A quick trip from southern Marin	Small area, rough surf

Rules on Duxbury Reef and in the Park

Duxbury Reef is a State Marine Conservation Area. Under California Department of Fish and Wildlife rules, it is illegal to injure, damage, take or possess any living, geological or cultural marine resource there. That means no shells, no rocks, no sea stars, no snails and no seaweed. The only exception is recreational fishing for finfish from shore (and abalone, but that fishery is closed until at least 2036).

The Park Service rules for tide pools at Point Reyes are simple:

• Look but don’t touch, and never remove an animal from a pool.
• Step only on bare rock or sand, not on mussels, anemones or seaweed.
• If you turn over a rock, put it back exactly as you found it.
• Never pull off an animal that is holding tight to a rock. It can tear.
• Take only pictures.

Agate Beach also bans camping and overnight parking, and groups of 20 or more need a county permit.

Staying Safe on the Rocks

The National Park Service tidepooling page is blunt about the risk. Tidepoolers have died at Point Reyes beaches after being hit by sneaker waves, which run far up the shore without warning. Never turn your back on the ocean.

Watch the clock as much as the water. Once the tide turns, it can cover a rock you crossed twenty minutes earlier, and on beaches like Sculptured and McClures it can close off the way back. Wear shoes with grip, since wet rock and seaweed are slick, and dress warmly. The water is cold, and you will be standing in it.