Saturday, Nov 24, 2018 @ 7:30 AM

Quad Dipsea

320 Throckmorton Street

Mill Valley, CA 28.4 Miler

This Event Took Place Sat. Nov 24, 2018

Postponing 2020 Registration Opening

At the beginning of the COVID-19 Pandemic we shifted the opening of registration from our normal August 1st to September 1st, to buy us a little extra time to see if we could get the pandemic sufficiently under control to safely hold this years event, scheduled for November 28th. To hold the event we need permits from the City of Mill Valley, the National Park Service, and California State Parks. And we need realistic and effective protocols in place to protect the health of participants and volunteers.

Our permitting agencies agree that under current circumstances and health guidelines we would not be able to hold the event. But circumstances could change in the next month or two, and county guidelines for outdoor events are expected soon. Therefore we are going to postpone the opening of registration until October 1st. It’s only a month from now, so realistically little may change, but I want to give us every opportunity to hold the 38th Annual Quad. And 60 days should be enough time for us to get the event organized, and for participants to get ready for 28 miles.

If we get to October 1st, and holding the Quad on November 28th looks possible I will provide more details on how we can safely accomplish that goal.


Stairs, hills, and more hills. About 9,000 feet of vertical packed into 28 miles.  It begins at 7:30AM at Old Mill Park (Throckmorton Avenue, Cascade Way, & Old Mill Street intersection), in Mill Valley, California. Within a few hundred yards the course heads up three flights of stairs as tall as a fifty-story building, and up some more through an old horse ranch to Windy Gap. Then it plunges down into Muir Woods, across Redwood Creek, and begins a tough grind up through both trees and grasslands over trail sections named "Dynamite", "The Hogsback", "The Rainforest", and "Cardiac." At the top of Cardiac, the course levels out with panoramic views of the Pacific Ocean before it plunges down over the rocks, roots, and stairs of "Steep Ravine" and the discouragingly steep but short climb up "Insult Hill." Finally, as the course follows the relatively gentle slope of The Moors toward the ocean, Stinson Beach is in sight a mile ahead. 

Once to Stinson, you turn around an head back to Old Mill Park following the same course. 

And then do it all over again for the QUAD!!

Note: unlike the Dipsea and Double Dipsea, the Quad Dipsea does not allow shortcuts. You must stay on the Dipsea Trail the entire way.)

Start, Time Limits, & Cutoffs

The start is 7:30AM , sharp, at Old Mill Park (Throckmorton Avenue & Cascade Way), in Mill Valley, California. The cutoff for the halfway point turnaround (Old Mill Park) is 12:00 noon (4 hours, 30 min.), the cutoff to leave Stinson Beach (beginning of Lap 4) is 2:15PM (6 hours, 45 min.), and the cutoff to finish is 4:30PM (9 hours).

Aid Stations

Aid stations located at Cardiac Hill, Stinson Beach, and Old Mill Park (start/finish and the halfway point).


Due to the single track nature of the course, no pacers are allowed, and the use of hiking/trekking poles is not permitted.

Refunds and Exchanges

50% refund if you withdraw by October 15. No refunds thereafter. No rollovers. No exchanges permitted, as there will be a wait list.

Wait List

if you are on the wait list, we will send out invitations to register as soon as cancellations occur and spots open up, but will finalize the entrant list by November 21st.

Local time: 10:15 AM


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