1450 Medical Center Dr., Rohnert Park, CA 94928 Driving Directions. Hours. Mon. - Fri.: 9 a.m. - 6:30 p.m. Weekends: Please visit Santa Rosa Urgent Care or Windsor Urgent Care Locations. Close at 5 p.m. on Christmas Eve and New Year's Eve Closed major holidays, open on MLK Day and President's Day ... your new patient portal..