Nordhoff Ridge to Chief and Nordhoff Peaks is a 18.1 mile lightly trafficked loop trail located near Ojai, CA that offers scenic views and is rated as difficult. The trail is primarily used for hiking, trail running, and mountain biking and is accessible year-round. Dogs are also able to use this trail.
I only hiked to Chief Peak (approximately 9 miles roundtrip), but the views made the trek worthwhile. I watched the sunset while hiking the Nordhoff Ridge with views of the Ojai Valley, ocean, and Channel Islands. Almost the entirety of the trail was on a fire road, and most of the elevation gain occurred in the first 2 miles. The final portion to the summit of Chief Peak is unmaintained but wasn't terribly difficult to follow. Be sure to stop by Rose Valley Falls before doing this hike -- it's a nice warmup before the climb.