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- May 9, 2026 from 9:00am to 1:00pm PDT
- Location: Walnut Creek Open Space, Shell Ridge
- Latest Activity: on Wednesday
The Ridge-to-Ridge Challenge is an annual fundraiser supporting Sustainable Contra Costa and its youth program, Sustainable Leaders in Action (SLIA). Each year, high school and college students collaborate to raise awareness about climate issues and inspire meaningful, sustainability efforts throughout Contra Costa County.
Choose Your Ridge-to-Ridge Experience
Participants will gather at the south end of Marshall Drive at 8:45am for opening remarks.
Fossil Hill Scavenger Hunt (~1.4 miles): A fun, interactive walking loop around Fossil Hill. Individuals or teams follow puzzle-style clues to locate scavenger points along the course. Participants photograph each location and race back to the finish once all points are found.
- Start Time: 9:15 AM
Where: At the end of Marshall Dr.
Indian Valley Nature Walk (~1.4 miles): A relaxed, educational walk featuring short talks from local experts on topics such as: Geology of Shell Ridge, Indian Creek restoration, History of Quarry Hill and Fossil Hill, Native plants and habitat restoration and Wildlife of the open space.
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Start Time: 9:15 AM
Ridge-to-Ridge Challenge Run (5K / 3.1 miles): A challenging and scenic trail run through the hills and valleys of the open space.
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Start Time: 9:00 AM
Where: At the base of Ridge Top Trail near the Brodia Way Entrance.
