Rockville Hills Regional Park is a 633-acre (~256 hectare, 2.56 square kilometer) regional park in the city of Fairfield, Solano County, California, United States.Rockville Hills Regional Park Website - Retrieved March 14, 2024 The park is known for its volcanic rocks, thin topsoil, grasses, and blue oak trees.Rockville Hills Regional Park and Vintage Valley Trail - Retrieved March 14, 2024 There are also oak woodlands, grassland savannas, chaparral and some aquatic habitats.Rockville Hills Regional Park Habitat Website - Retrieved March 14, 2024

History During the 1960s, the city of Fairfield was going to build a golf course on the land. However, they decided to transform the area into a trailed park instead.East Bay Hikes Rockville Website - Retrieved March 14, 2024 In 2012, nearly 200 oak and manzanita trees were removed from the park at the behest of PG&E, the major California power company, to avoid sparking fires.

In 2015, it was reported to be one of the best mountain biking spots in the San Francisco Bay Area by the Sacramento Bee.

In 2018, the park was closed due to a red flag warning, a wildfire probability warning. This is despite the fact the park has never suffered from a conflagration. Also, in 2018, the local 4-H club cleaned garbage, planted endemic trees, and planted moss spores over graffiti covered stones.

Wildlife The park is home to cows and birds in addition to deer, fox, waterfowl, hawks and bobcats.

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