If you are applying for winter or spring, check with the campus Admissions Office about whether the program you are interested in is accepting applications. If your application is not accepted due to closures of any kind, the UC Undergraduate Application Processing Service will notify you by mail and will refund the application fee. All University campuses are on the quarter calendar except Berkeley, which is on the semester system. You may not be able to enroll at the University for winter quarter if the fall semester at the institution where you are enrolled does not end prior to January 1. To apply online you must have access to the Internet via a computer that meets certain minimum requirements.
Details are available online.
Follow the instructions to download and print the form and instructions. You may submit an application form you download and print. If you submit a printed application by mail, you should obtain a U.S. Postal Service Certificate of Mailing for your records. Do not use an overnight delivery service or registered or certified mail as this will delay processing of your application. If you are overseas, use air mail.