August 2025 Book Sale

Mark your calendars now for the Friends of the Castro Valley Library 2025 Summer Book Sale:

• Friday, August 1st from 6 - 8 p.m. (Members-Only Preview Night)
• Saturday, August 2nd from 10 a.m. - 4 p.m.
• Sunday, August 3rd from 1 - 4 p.m. (It's Bag Day, where a bag of books is only $5, and we supply the bags!)

We will need volunteers for all sale days as well as for the set-up and clean-up days. Contact us at 510-733-3285 or This email address is being protected from spambots. You need JavaScript enabled to view it. if you want to volunteer, or if you have any questions about the work or requirements. A signup sheet will be available in the Friends office approximately one month prior to the Book Sale date.

Members planning to attend? Please remember to bring your current (2025) Friends of the Castro Valley Library membership card on Friday and Saturday in order to take advantage of your $2.00 discount.

You can join or renew at the door, or purchase a 2025 membership ahead of time. 

Friends of the Castro Valley Library

Friends of the Castro Valley Library is a non-profit 501(c)(3) organization serving our community and supporting the Castro Valley Library by providing funds for library services, organizing fund raising and community activities, advocating at the local, state and national level for public support of libraries and developing an active and well-informed membership.

Our BookStore contains over 2500 almost new and used books, audio books, CDs and DVDs with a constant turnover of the inventory. Only the best quality of all the donated books are sold in the store. Special books may be sold online through Ebay. In addition, each year over 1200 boxes of good quality books and audio-visual materials are put in temporary storage for our three annual weekend Book Sales. Remaining books are donated to deserving organizations and programs throughout Alameda County.