Located at the SLAC National Accelerator Laboratory, this 17,600-square-foot facility contribute to the health and wellness of the laboratory’s employees and visiting scientists. The rec center is the sixth Stanford University sports facility to bear the name of donor John Arrillaga and his family.

Face-coverings are optional, yet recommended, for those who are vaccinated (effective on Monday, July 19).

Fitness Classes at SLAC

Approved onsite SLAC employees can now register for Fitness Classes at ARCAS lawn.

Fitness Classes Information


  • As San Mateo County is now experiencing substantial community transmission, ARCAS now requires members to wear face-coverings in the facility, regardless of vaccination status.
  • Fully vaccinated people do not need to wear face coverings outdoors.
  • All members are required to show their green badge from the Stanford Health Check upon arrival.
  • Visit the COVID-19 Resource Center for an updated graphic of on-site safety protocols. 
  • All personnel must fill out a liability waiver form prior to using the Recreation Center. 
  • No guests are allowed at this time.
  • A SLAC Badge is required to get to the Recreation Center, and must be swiped on the badge reader upon entering.
  • No one under the age of 18 is allowed in the facility.


Monday6 AM - 2 PM
Tuesday11 AM - 7 PM
Wednesday6 AM - 2 PM
Thursday11 AM - 7 PM
Friday6 AM - 2 PM


Arrillaga Rec Center at SLAC (ARCAS)
2575 Sand Hill Road
Building 55 (Eastern SLAC, on Pep Ring Road north of Building 901)
Menlo Park, CA 94025

Front Desk: (650) 926-3313 and Fitness Center: (650) 926-3314


Available to rent front the front desk, $10/quarter $30/year.


The ARCAS parking lot is for Recreation Center patrons only during their visit, you may not park in our lot all day.

Facility Rental

For facility rental inquiries, please contact Alisha Garcia at alishag@stanford.edu.