Field-based Nature Learning In & About the Klamath-Siskiyous

Education • Research • Community • Science • Exploration

Brief History of the IV

Upcoming Events

A Brief History of the Illinois Valley

Join us for a FREE learning program and Q&A with instructor John Roth, Thursday September 21, from 6-7:15 PM at SFI.

The Illinois Valley is remarkably diverse. Per acre, it has one of the densest collections of different of climates, soils, rock types, endemics, relicts, and Ameridian languages. It is also rich with evidence of ancient climates, seafloors, shorelines, and peoples. Explore why so many diversities coincide in this area, what was here before the valley, and will our region travel to Alaska.

SFI Field Courses

Offering field courses throughout the Klamath-Siskiyou bioregion. From professional ecologists to amateur naturalists, we have have workshops and opportunities for all.


Fall 2023 field courses are out now! Join us for for classes on volcanic geology, mushrooms, condors, and more.

Browse Courses & Register Below:

Youth Education Programming

Outdoor School was a success! We are so grateful for the groups that joined us this season and we are already excited and getting ready for next year!


We are currently offering ropes course sessions for day-rentals. Get in touch for your summer camp adventure needs!

Keep Posted on SFI Happenings

Explore the latest from SFI through our quarterly newsletter, The Darlingtonia, and get monthly updates on upcoming courses, free learning opportunities, and events. 

You can sign up to receive The Darlingtonia or our seasonal field course brochure by joining our mailing list below.

View the latest SFI newsletter:

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Siskiyou Field Institute Members Save 10% on Field Courses, Lodging, Youth Camps, and SFI Merchandise!