Participants will walk an average of 20-miles a day, for three straight days.
The walk is part of a nationwide event to raise money for breast cancer research, education and health programs.
The Bay Area walk takes participants through Daly City, San Francisco and into Marin County.
"It's like you have three days to make a difference for a good cause and we're just happy to be here," said participant Janie Hillyer.
Along the way there are cheering stations and walkers sleep in pink tents each night at various camp sites. On Sunday afternoon, closing ceremonies will take place at San Francisco's Marina Green.
The event began in 2003 and now rolls across the country, visiting 15 cities -- it started in Boston in July and the 3-day last walk wraps up in San Diego next month. Each walker this year has raised a minimum of $2,300.