The elevation gain is 2,200 feet. Participants will first walk through the forest to Indian Springs and then hike out in the open, amid the granite slabs and pinnacles where the postcard views of Mt. Shasta and the Crags become more and more spectacular.

The Siskiyou Science Festival and the Mount Shasta Trail Association invite the public on a strenuous and sometimes steep, 5.5 mile roundtrip hike to the sky scraping granite spires called Castle Crags on Sunday, May 19.

The elevation gain is 2,200 feet. Participants will first walk through the forest to Indian Springs and then hike out in the open, amid the granite slabs and pinnacles where the postcard views of Mt. Shasta and the Crags become more and more spectacular.

Castle Crags are actually part of the Klamath Mountains, not the Cascade Range, and are much older. They were formed by granite magma slowly cooling underground (as a “pluton”) and subsequently becoming exposed at the surface through uplifting and erosion.

This is the same way that the granites of Yosemite formed. In fact, the Klamath Mountains broke off from the Sierra Nevada about 60 million years ago. Mt Shasta, in contrast, was formed by relatively recent surface eruptions (within the last several million years) and its rock is andesite ( a type of basalt).

The meeting place for Sunday’s hike is 111 Morgan Way in front of The Best Western Tree House in Mount Shasta at 9 a.m. Participants will carpool to Castle Crags State Park.

Bring lunch and water and expect to return about 4:30 p.m. With questions call Joan Roemer (530) 926-0647.