The State Rec Area closes at dusk - most parking areas are self-paid
Most of Auburn SRA is open from 7 am to sunset. Leave early enough to be off the trails before dusk. Most parking requires self registration fees in cash envelopes (or annual state park passes), and is enthusiastically enforced. Check the Auburn State Recreation Area website at parks.ca.gov/?page_id=502
for current information. Note that the park's policy is that technical roped climbing is only permitted in the Cave Valley/Quarry area - outside the fenced private quarry at the back. Unroped climbing - aka bouldering or DWS - is allowed everywhere with a safe landing.