1. Start at the trailhead, heading NE.
2. 0.2 miBear left onto Ohlone Trail, heading N.
3. 0.3 miContinue straight onto West quarry path, heading NE.
4. 350 ftContinue straight onto Ohlone Trail, heading N.
5. 0.3 miTurn right, heading NE.
6. 50 ftContinue straight onto Blue Oak Trail, heading E.
7. 1.1 miReach West quarry path, then turn around and head back the way you came.
8. 1.1 miTurn left onto Ohlone Trail, heading W.
9. 0.3 miContinue straight onto West quarry path, heading S.
10. 350 ftContinue straight onto Ohlone Trail, heading SE.
11. 0.3 miBear right, heading SE.
12. 0.2 miArrive back at the trailhead.

Each distance is the walk from the previous step. Tap a step for a map of its junction.

Trail map, photos and weather for this hike: www.ambleway.com/hikes/thorn-alley-out-back