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Race Across California is a 100-day virtual challenge that progresses west across the map from the California-Nevada border to the Pacific Ocean. It takes place from early July into early October. Participants complete their miles in their own locations, not on a closed road course. The format is flexible, allowing participants to walk, jog, run, hike, bike, row, paddle, or swim, with distance goals adjusted for the chosen activity.
The Alcatraz Open Swim is a 1.4-mile swim across San Francisco Bay, from Alcatraz Island to Aquatic Park. The South End Rowing Club organizes it in September. Bay water temperatures are typically 62 to 64 degrees Fahrenheit, making this a cold open-water swim, not a pool endurance event. Swimmers check in, get body marked, and drop bags at the South End Rowing Club before boarding a ferry at Pier 43.5 to Alcatraz. The event was formerly known as the Alcatraz Invitational and has been held for approximately 30 years. It is open to experienced swimmers, who receive practical recommendations such as wearing earplugs and a thermal cap beneath the mandatory yellow swim cap. The weekend also features a pasta dinner prior to the swim, breakfast at the finish, merchandise available near the club, and an awards ceremony once all swimmers have completed the course.
Listed in our event index as Mount Afton Challenge.
Running: Locals run the Embarcadero when they want steady Z2 with constant foot traffic. Golden Gate Park gives the GG Park Loop, Kezar Stadium, the Panhandle, and enough runners to make intervals feel normal. Lake Merritt gives an almost perfect 3-mile lap, and Lake Merritt Joggers and Striders keeps the 5K/10K rhythm on the fourth Sunday. Tilden Regional Park gives Meadows Canyon Trail, Curran Trail, Wildcat Gorge, and Nimitz Way, which runs 9 miles out and back. Fat Boys Run Club, Marina Run Club, Midnight Runners, North Beach Run Club, Track & Feels, and Golden Gate Running Club keep the week moving. Fillmore-Japantown Find-Your-Way 5K, 10K San Francisco makes a good anchor event.
Cycling: Locals ride the Bay Trail for base miles, then point the bike at Oakland Hills Gravel when they want dirt. Oakland Hills Gravel is an underrated joy, with Joaquin Miller Park, Reinhart Redwoods Regional Park, and Anthony Chabot Parks giving steady pitches, good signage, and bay views. Redwood Regional Park links East Ridge to West Ridge for an 8-9 mile bike loop, and the climbs can hit 15-20% grades. Marin Headlands, Hawk Hill, Mt. Tam, and Mt. Hamilton bring the climbing work. Waffles 'n Wheels, AIRcc, East Bay Mochi, Be the Change CC, Berkeley Bike Club, Alto Velo Racing Club, and ACTC cover the group-ride spread. Mount Hamilton Challenge and Shiny Side Up sit nicely as anchor events.
Season: September and October are the prime months because San Francisco usually gets warmer weather, clearer skies, and great morning light. Summer keeps San Francisco and the Golden Gate side foggy, while the South Bay and inland miles can feel warm and sunny. Locals treat that as normal and pick routes by microclimate, with Z2 on the Bay Trail, singletrack in Redwood Regional Park, or intervals in Golden Gate Park. Winter runs from November to March, and the season brings about 82% of the annual precipitation. Runners still use the Embarcadero, Lake Merritt, and Golden Gate Park, while riders keep road miles, gravel days, and cyclocross legs flexible around the rain.
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