How to Join Circle of Sisters

  • Circle of Sisters is open to all girls in Sonoma County ages 9-12.

  • All COS participants and an adult guardian must fill out an application form and return it to their COS group leader. Our application form is available in both English and Spanish.

  • Please look here for a list of current sites. If there is not a Circle of Sisters site at your school, it is still possible for you to join another site provided that you have transportation. For more information, please contact the COS office at 707-525-5311 or