When

The 2025 Grizzly Peak Century will be held on Sunday May 4, 2025.

Where

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.

Gravel Routes New!

This year we offer two gravel routes; 100 km and 65 km, which include some rest stops that are shared with the road routes. Both routes explore some of the greatest hits in our wonderful East Bay Regional parks. The 65k route traverses Redwood Park before hitting the trails of Tilden and Wildcat Canyon Parks. Then it goes up and over the ridge to Old San Pablo Trail before joining the road riders for the trip back to St Mary's. The 100k route is identical to the 65k route except it adds a challenging early morning loop through Lake Chabot Park.

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.

Fees

Entry fees for 2025 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.

Included

• 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.

Electronic Navigation New!

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.