The main entrance and parking lot are located at 409 W Riordan Rd., two blocks east of Milton Rd. next to the NAU parking garage.
Festival of Science Lecture: The Merriam Expedition to San Francisco Mountain — Life Zones and the Founding of Ecology
Riordan Mansion State Historic Park
Sunday, September 27, 2026 6-7 p.m.
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This special lecture for the Flagstaff Festival of Science is presented by historian Roy May. Roy will tell the story of the 1889 C. Hart Merriam expedition, its origin, and importance. Merriam developed the Life Zone concept as a means of describing areas with similar plant and animal communities, which helped shape founding principles of ecology.
The lecture is free, but space is limited. Reserve your spot online at https://azstateparks.com/
MORE EVENTS
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Tuesday, August 25, 2026
Evening Lecture: The First 100 Years of Route 66 in Arizona: Reflections on the Visual Imagery and Stories of Route 66
Join presenters Ivan Pacheco and Peter Runge to trace Route 66’s evolution from a rugged transportation corridor to an enduring cultural icon, highlighting the communities, businesses, and landscapes that defined travel across northern Arizona. The presentation will be free thanks to Riordan Action Network. Registration is required.
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September 12-13, 2026
Girl Scouts Love State Parks Weekend
An activity table will be set up in the visitor center with information and activities for girls to earn their Riordan Mansion patch. Activities are included with park entrance fee.
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Sunday, September 13, 2026
Tea on the Veranda
Step into 1904 and have tea on the veranda, just as the Riordans did at the beginning of the last century. This event is brought to you by Riordan Action Network and Northern Arizona Celtic Heritage Society.
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Tuesday, September 22, 2026
Evening Lecture: Bats of Northern Arizona
Riordan Mansion is proud to offer this Bat Conservation International-guided Bat Presentation and Walk. Kathleen Slocum will share the fascinating story of bats in Arizona, followed by a walk on the Riordan Mansion grounds. Registration required.
