Diablo Hills Golf Course sits in Walnut Creek, a suburban city in the East Bay region of the San Francisco Bay Area, at the base of Mount Diablo. Designed by Robert Muir Graves and opened in 1965, the course occupies rolling terrain characteristic of the inland valleys east of the Berkeley Hills. Graves, a prolific Northern California architect active from the 1950s through the 1980s, designed numerous public and daily-fee courses throughout the region, typically working with natural landforms to create accessible layouts for recreational golfers. The course plays over moderately hilly ground with elevation changes that provide views of the surrounding hills and the distinctive profile of Mount Diablo to the east. The routing takes advantage of the natural contours, with holes moving up and down slopes and across small valleys. Mature trees—primarily oaks and other native species—frame many fairways, and several holes require approach shots to elevated or sloped greens. The layout is straightforward in design, reflecting the era's emphasis on playability for public-course golfers rather than championship length or severe hazards. As a municipal facility operated by the City of Walnut Creek, Diablo Hills serves local residents and visitors seeking an affordable round in the East Bay. The alternate tees provide different yardages and angles, allowing the course to accommodate players of varying skill levels. The setting offers a suburban golf experience with views of the surrounding East Bay hills and the landmark mountain that gives the course its name.