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Longmont Archives

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The Longmont Archives is your best place to come for Longmont history, the Chicago-Colorado Colony, research on an old Longmont house, information about an old building in downtown Longmont or any other topic about the past in Longmont. The Archives contains historic photographs, letters, diaries, maps, business records, school records and more. Our friendly staff can help you with your research.

archivesLocation: Second floor of the Longmont Museum, 400 Quail Road.

Regular hours: By appointment Monday through Friday, 9 am to 5 pm. Call (303) 651-8969.

The Longmont Museum’s archives contain more than 12,000 historic photographs of Longmont and the St. Vrain Valley. Search our online photos for a growing selection of digitized images, or come to the archives to see the full collection.

New! A preliminary guide to the Longmont Times-Call clipping file collection is now available. This guide to the large collection of the Longmont Times-Call newspaper housed at the Longmont Archives will help researchers use this historical resource, which is available by appointment.

Online Longmont Research Resources

Historic photos online
Longmont Public Library
Longmont Museum collections on the Rocky Mountain Online Archive
Historic Longmont Buildings
Searchable online archive of The Daily Times of Longmont newspaper, 1925-1927.

Guides to Individual Archival Collections

Seth Terry Collection Finding Aid
Seth Terry 1871 diary transcript
Calkins Family Papers Finding Aid

For more information and to schedule an appointment, contact Erik Mason at the Longmont Museum, (303) 651-8969,

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