43° F

Experience Level



6-7 miles/day


8,600–10,000 feet

Registration Fee


Program Overview: Remarkable rock formations, including sheer cliffs, polished domes and soaring peaks, are among Yosemite’s most recognizable features — and are one of the reasons the park is designated as a UNESCO World Heritage Site. In this two-day Yosemite Field School course, you’ll explore geologic features in the Tuolumne Meadows area with the ultimate rock guide: Greg Stock, Yosemite’s park geologist.

During day hikes on Thursday and Friday, you’ll get the inside (and ancient) story of Yosemite’s peaks, domes and cliffs. Learn how glaciation has shaped the Sierra Nevada landscape, from the jagged nunataks that jutted out above the ice to the erratic boulders left behind when the glaciers melted. Bring your scientific curiosity and rock-related questions!

Can’t wait to learn about Yosemite geology? Check out the “Granite” episode of Yosemite Nature Notes, and read our blog about the park’s geoheritage.

Know Before You Go

  • When: Thursday, August 19 (12 pm to 6 pm) and Friday, August 20 (morning to around 4 pm)
  • Where: Tuolumne Meadows
  • Registration includes: Guided day hikes, park entry (as needed), and three nights of tent camping at a shared group site at Tuolumne Meadows Campground (August 18, 19 and 20). There is no discount if you choose not to use the included gate pass or campsite.
  • Lodging options: Tent camping included. Camping dates cannot be adjusted. No additional lodging options have been arranged for this program, but guests are welcomed to find their own alternate accommodations if desired.
  • Experience level: No experience necessary, but participants should be physically fit and prepared to hike 6–8 miles per day at high elevation.

View a suggested packing list.

COVID-19: We have implemented special safety measures to keep participants and instructors safe during the ongoing pandemic. For example, participants will hike single-file and keep moving to avoid crowding the trail, and instructors will stop to offer interpretation only when there is ample space to stay at least six feet apart. Please review our COVID-19 procedures for details.