Join the Grotto

CaveWe’re thrilled that you’re interested in becoming a member!

The purpose of the Cascade Grotto is to promote and advance the study and science of speleology, the protection of caves and their natural contents, and to promote fellowship among those interested in these goals. Membership is open to all persons interested in these purposes.

First, download and fill out our Membership Application. Send the completed form* along with your dues (if paying by check or money order) to our mailing address at:

Cascade Grotto
P.O. Box 66623
Seattle, WA 98166

Alternatively, use PayPal to send your dues to: (Payment by credit cards coming soon!!) Be sure to add your name, email, and phone number to the “notes” section on the PayPal interface.

*Please give us two weeks to process all membership application; email any questions about prorated dues to, attn: Treasurer; Thank you for supporting the Cascade Grotto!