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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 landforms — 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 Friday, Saturday and Sunday, 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: Friday, August 12 (4 pm-7 pm, Saturday, August 13 (full day hike) and Sunday, August 14 (full day until around 3 or 4 pm)
  • Where: Tuolumne Meadows
  • Registration includes: Guided day hikes, park entry (as needed), and three nights of tent camping at a shared campsite (August 12, 13 and 14). There is no discount if you choose not to use the included gate pass or campsite.
  • Lodging options: Tent camping (included), or upgrade to Tuolumne Meadows Lodge for an additional fee. Camping and lodging dates cannot be adjusted. The upgrade option expires 30 days before the program. Lodging information will be sent immediately after registering.
  • 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. Please review our COVID-19 procedures for details.