Mill Valley marathon swimmer Catherine Breed is set to wade into an unprecedented challenge today, planning a staged swim of the entire California coastline. Her goal: about 900 miles from the Oregon border to Mexican waters by November. The route is broken into daily legs, with Breed expecting to spend roughly five hours in the water most days while a small support boat tracks her every stroke.
Breed, 33, has already logged a resume full of long, cold‑water efforts, including a record Monterey Bay crossing and a 27‑mile Golden Gate‑to‑Half Moon Bay swim. Those grueling tests helped her build the endurance and logistics savvy she is banking on for this latest attempt. As reported by Sports Illustrated, Breed has spent years methodically planning and training for what she calls Swim California.
How The Route And Schedule Look
Breed’s project, Swim California, is laid out as a staged coastal route of roughly 900 miles running from the Oregon border south to Mexico, with a three-to-four-month timeline and built‑in weather buffer days, according to Swim California. The team plans to track her progress with GPS waypoints, come ashore most nights, and hold occasional pop‑up events along the way to highlight local conservation groups.
A 52‑Foot 'Winnebago On The Sea'
Shadowing Breed will be a five‑person support crew living aboard a 52‑foot sailboat, which captain Matthew Sessions has compared to a Winnebago on the sea while outlining the team’s roles in navigation, safety and documentation. The crew will also operate a small tender that will pace Breed in the water and pass her quick‑fuel feeds so she can keep a steady rhythm during each day’s stage, according to the San Francisco Chronicle.
Safety, Weather And Wildlife
“I can swim through almost anything when I’m in the water,” Breed said. Her captain is a bit more tied to the forecast: winds at or above 20 knots will force a shore day, so the schedule bakes in extra buffer days, according to the San Francisco Chronicle. For the marine life she cannot control, Breed plans to wear a Sharkbanz anklet to deter sharks, while the tender crew hands her carbohydrate‑rich drinks about every 30 minutes and keeps watch for nets, jellyfish and other hazards in her path.
Conservation And Community Stops
Beyond the sheer athletic gamble, Swim California is framed as a storytelling and conservation effort funded through Breed’s nonprofit Sea Dreamers. Organizers say she will stop for pop‑up events along the coast to spotlight local ocean‑protection groups. Sea Dreamers and the Swim California media kit lay out fundraising goals, an ambassador program and ways volunteers can support the route, as posted on Sea Dreamers.
Daily updates and GPS tracking are set to be posted on the Swim California website and through the project’s social channels, according to Swim California, for anyone who wants to follow her crawl down the coast in real time. Supporters and local groups are already organizing in likely stopover towns, and Breed’s team says the journey, if she finishes it, will stand as a rare, statewide endurance moment for California’s shoreline.
