Castle Peak is the throat of an ancient volcano and its three turrets are easily visible form nearby Interstate 80 at Donner Summit. Just as Donner Peak overlooks the original Donner Pass (old HWY 40) and is popular with skiers, hikers and climbers, Castle Peak overlooks the newer pass (I-80)
This is a 6.2 mile out and back trail rated as hard as per Alltrails.com with some class 3 rock scrambling.
Elevation gain is 1903 ft.
Approx. 3 hour hike time.
Take Interstate 80 to the Castle Peak/Boreal Ridge exit. In the winter it is often necessary to park at either the Sno-Park or the Boreal Ridge parking lot. Both are on the south side of the freeway. Otherwise everyone just parks on the road to the north of the freeway exit where it is paved, free and often crowded.