Granite Mountain Trail is a 6.5 mile out and back trail located near Julian, CA and is only recommended for very experienced adventurers. The trail is primarily used for hiking and is accessible from November until April.
It's a little tough to climb but the view's are definitely worth it
This hike is harder than it seems by looking at the map ----- lots of pretty steep pitches while simultaneously boulder hopping, so its difficult to get into a good climbing stride. The view from the top is well worth it, and you'll likely have the place all to yourself!