2021 Grizzly Peak Century
COVID-19 update

Due to the continuing situation, we are not able to plan for an actual ride in May of 2021. We are now planning a Do-It-Yourself event in early September, alongside a fully supported event on September 12, 2021. We take the health and safety of our riders, volunteers, and community seriously and urge everyone to continue to follow the guidelines set forth by public health officials.

Hope to see you on the road again soon!


Fully supported century: Sunday, September 12, 2021

Do-It-Yourself century: August 28-September 11, 2021


The main start/finish and post-ride meal location is Campolindo High School, 300 Moraga Rd, Moraga, CA. Parking at Campolindo is limited, so if you are driving there, please try to carpool with other riders if you can. We also offer a car-free alternative start in Tilden Park. For details on both options see our Start Locations page.

Start Times

Rider check-in is 6:30 am to 8:30 am at Campolindo (7:30 am to 10:00 am at Island Picnic Area in Tilden Park if you use the alternative car-free start). We urge slower riders to get an early morning start.

Route Options

There are three routes to choose from, all of them very hilly: 50 miles, 75 miles, and 100 miles. The latter two routes are identical for the first 73 miles (the north loop), at which point the 75 mile route returns to the finish while the full century route continues on to the south. For more information see the Routes page.


Entry fees for 2021 range from $75 (early registration) to $100 (century day, if available). The ride is limited to 1,000 riders and has sold out for many years, so you should register early if possible.


  • Your choice of three beautiful routes
  • Cue sheet and road markings
  • Rest stops at 15 - 25 mile intervals
  • Clothing drop at the first rest stop (Island Picnic Area)
  • Basic mechanic service at all rest stops
  • SAG vehicle support
  • A fabulous post-ride barbeque

Now Insured!

In 2017 many local cycling events were affected by road closures due to winter storm damage and some events in the Pacific Northwest were affected by wildfires. In response, starting in 2018, the Grizzly Peak Century has purchased Event Cancellation Insurance. This will allow us to offer riders a full refund if our event must be cancelled due to road closures, fire, earthquake, extreme weather, or other natural disaster, even if we have already spent part of the registration fees on non-refundable century preparations.

T-shirt art from the 2018 Century
by Stephen Linden

Other Items For Sale

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

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 March 1, 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.

Donations (Where does my fee go?)

We donate most of the 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.

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