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Summer Public Hours

Mondays 2:30 pm – 5:30 pm and Fridays 10 am – 1 pm

Email us for an appointment on other days.

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.


Visit our Programs page for upcoming events. Subscribe to our email list to stay in the loop.

Research requests

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

In the Archives

We have thousands of printed items related to the history of Altadena. Visit this page for details.

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.

Honoring a hero

We celebrated the life of activist Ellen Garrison Clark—and purchased a headstone for her grave.