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The 2024 Grizzly Peak Century was held on Sunday May 5, 2024.

After consultation with East Bay Regional Parks District, both gravel routes have been canceled to protect the trails after very wet weather less than 24 hours before our event. Gravel riders are invited to join any of the four road routes. Dry weather is forecast, all rest stops will be open, the post-ride meal, live music, and party will take place. See you then!


The main start/finish and post-ride meal location is St Mary's College, 1928 St Mary's Rd, Moraga, CA. We also offer a car-free alternative start in Tilden Park. For details on both options see our Start Locations page.

Start Times

  • Check-in is 6:30 am to 7:30 am at St Mary's for the 100 mi road route and the 100K gravel route.
  • Check-in is 7:30 am to 8:30 am at St Mary's for all other routes, or 8:30 am to 11:30 am at Island Picnic Area in Tilden Park if you use the alternative car-free start.

Road Route Options

There are four paved routes to choose from, all of them very hilly: 30 miles, 50 miles, 75 miles, and 100 miles. The 100 mile route starts earlier and does a full south loop first. For more information see the Routes pages and the RideWithGPS Event page.

The 75 mile and 100 mile routes will again use a section of the San Francisco Bay Trail between Pinole and Rodeo. When you get to this section, be sure to slow down, be courteous to other trail users, and enjoy the view. Please don't jeopardize our future use of this great resource!

Gravel Routes New!

This year we offer two gravel routes; 100 km and 50 km, which include some rest stops that are shared with the road routes. The 100K Gravel Route explores some of the greatest hits in our wonderful East Bay Regional parks. The first half of the day will take you through Sibley, Tilden, and Wildcat parks before turning south to revisit Sibley en route to Chabot park where the difficulty ramps up! The route covers about 63 miles and 8500 ft of elevation. The shorter 50K route will skip Chabot to send you back to Saint Marys College by way of Redwood park's East Ridge trail.

Gravel Riding

Where does my fee go?

We spend most of your entry fee on the food and services and venues needed to provide you with a great riding experience. Starting in 2022 we de-emphasized our goal of charitable fundraising and re-focused on keeping our event affordable and fun for our cycling community. We don't want to lose money, but we aren't pressured by a need for profit or donations either. Although the amount will be smaller than in past years, we still donate proceeds raised from our century to organizations and causes that promote or help bicycling in some way — be it advocacy, safety, education, awareness, or the bicycling environment. See our donations page for details.

St Mary's College Start/Finish


Entry fees for 2024 range from $90 (early registration) to $120 (century day, if available). The ride is limited to 1,000 riders so you should register early if possible.


  • Your choice of many beautiful routes
  • Cue sheet and road markings
  • Rest stops at 15 - 25 mile intervals
  • Clothing drop at Island Picnic Area rest stop
  • Basic mechanic service at rest stops
  • SAG vehicle support
  • A fabulous post-ride barbeque, including live music and a free beer (or two) from local favorite Oakland United beerworks.
  • A souvenir pair of GPC Century socks

Other Items For Sale

See our Merchandise page for information on custom designed T-shirts which can be ordered with your registration.

All of the routes are available for electronic navigation. You can download files to your cycling computer. Also, during the event you can enjoy free access to the paid navigation features of the RideWithGPS smartphone app, including turn-by-turn voice navigation and offline maps. To get started, visit the RideWithGPS Event page and click on the RSVP button. You'll be prompted to set up a free account if you don't already have one. After you successfully RSVP, you will receive an email with details and instructions for downloading and using the app.

Century Prep Rides

Join us for a series of nine rides for intermediate bicyclists who want to build stamina and increase range. The rides will be on consecutive Sundays, beginning in March, and will gradually progress in distance from about 25 to about 55 miles. All are over moderately hilly terrain, similar to that of the century. Those who complete the series should be well-prepared to ride at least the 75 mile (metric century) route. For more information see our Century Prep Series page.

Event Cancellation Refund Policy Important!

With the exception of the Covid cancellation in 2020, our century has never been cancelled after registration opens. However, we recognize that wildfire, air quality, public road closures, extreme weather, pandemics, and other events outside our control could force a cancellation. Most of these events are no longer insurable. If cancellation is necessary, we will first pay all costs that we have incurred and cannot recover. Then we will refund the remainder to our registrants. We will not withhold funds for our club or for charitable donations.

Let our motto be your guide
Ride to Eat and Eat to Ride!