As per the Grand Lodge of California:
How to become a Mason
Membership is open to men age 18 and older who believe in a Supreme Being and meet the qualifications and standards. Men of all ethnic and religious backgrounds are welcome.
One of Masonry’s traditions is that we do not solicit members. Men must seek membership on their own initiative. When you’re ready to join, you can complete the request for information form and someone will contact you regarding membership. Or you can follow the steps below:
First, use the lodge locator (at right) to select the lodge to which you wish to apply. This lodge may be close to your work or home, whichever is most convenient. Contact the lodge you choose to schedule a visit during an event, at which time you can request a membership information packet.
When you have completed the application form included in the packet, it must be signed by two Masons who recommend you for membership. You will have met some Masons at the lodge event. You can also contact the lodge secretary for assistance.
Return your application and the specified application payment. The lodge will schedule visits in your home with selected lodge members to discuss your application and to answer your questions. Your application will be voted upon at the next lodge meeting.
You will be notified of your acceptance as a candidate for the degrees, and you will receive instructions about the three degree ceremonies. The degrees explain Freemasonry and give you the opportunity to experience the lodge’s traditions and fellowship. When you complete all three degrees, you become a full member.