We are cavers. We are explorers. We are the
Northern Rocky Mountain Grotto

Welcome to the Northern Rocky Mountain Grotto website! We invite you to become part of our caving community. The NRMG is a recognized Internal organization of the National Speleological Society (NSS).

We are Montana’s only grotto!

Chartered in 2000, our purpose is to promote the discovery, exploration, scientific study, and conservation of caves and karst. Our club consists of members who actively survey, inventory, map, photograph, monitor, and recreate in caves in all parts of the state of Montana, Idaho, the Northern Rockies, Canada, and beyond! Although our core group is centralized in Montana, our membership is diverse and currently spreads across Washington, Idaho. Wyoming, Utah, Texas, and California! The NRMG is a unique club – we are very spread out,  yet somehow we’ve kept our club active and together for over 19 years!


The NRMG is 254 members strong!
Learn more About Us and Join the NRMG today.


Recent Grotto News and Announcements


Upcoming Events

Horsethief Cave Resurvey

Horsethief Cave Resurvey

Begins:
Aug 19, 2023
Ends:
Aug 20, 2023
Horsethief Cave Resurvey

Horsethief Cave Resurvey

Begins:
Sep 16, 2023
Ends:
Sep 17, 2023

Previous Events

Horsethief Cave Resurvey

Horsethief Cave Resurvey

Started:
Oct 15, 2022
Ended:
Oct 16, 2022
Horsethief Cave Resurvey

Horsethief Cave Resurvey

Started:
Sep 17, 2022
Ended:
Sep 18, 2022