The official address for Joseph D. Grant County Park is:
18405 Mt. Hamilton Rd.
San Jose, CA 95140
We recommend you use the below map to get yourself accurate directions. Alternatively, some people will just punch in the intersection of Quimby Road and Mount Hamilton Road (the park entrance is just east of that intersection on Mount Hamilton Road). That will put you very close to the park entrance.
Our preferred route is to come up Alum Rock Avenue and then take Mount Hamilton Road to the park entrance.
Most GPS and cell phone directions will take you up Quimby, and that might be a slightly shorter route, but it is also a slower, more winding (car-sickness-inducing). We recommend not coming up Quimby.
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