5 /5 Sam: Really nice 63-acre park with fantastic hiking trails for a neighborhood park. Can climb 250 ft. to fairly unobstructed views of the valley and foothills, or stay on flatter trails. Most hiking routes are about 1-mi, but these can be easily extended to view the full park.
Ignore the hours on Google maps: according to the park’s website, its hours are 8 am to sunset. Dogs are allowed on-leash. Many warning signs indicate that alcohol is prohibited.
As the name suggests, the park is situated in an Blue Oak and Coastal Live Oak grove (according to the Audubon society, this is one of the last remaining large oat tracts on the Santa Clara valley floor). There are also rock outcroppings and you can view an abandoned sandstone quarry. Birdwatchers may be able to spot woodpeckers and scrub-jays, among many other types of birds.
There are public restrooms but no BBQ pits or sports fields. However, the Oak Grove park borders the Martin-Fontana parks to the south, which do include open grass, a playground, and an off-leash dog park.