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Please pardon our digital dust—we’re updating our website. We’re adding photos and hunting down typos.

Serving Altadena since 1935

The Altadena Historical Society (AHS) was founded in 1935. As a 501(c)3 organization, we gather, preserve, and share print and digital information about the people, places, and events that have shaped the Altadena community.

New hours

Visit from 10 am to 1 pm on Mondays and Fridays. Email us for an appointment on other days.

Research requests

Wondering about the history of your house? Or a notable person from Altadena’s past? Just ask us.


The “Eyes on Altadena” photojournalism exhibit continues. Read more.

A slice of history

See “Fourteen Decades of Altadena History 1883-2017” at the Altadena Community Center.

Travel to the past

The Disneyland of its day, the Mount Lowe Railway drew visitors from around the world.


We celebrated the life of activist Ellen Garrison Clark. Watch on YouTube.