All the routes are sport routes raging from 5.10 to 5.12. The seasons are the same as for the other summit crags, spring through fall.
Getting There
Driving up the Catalina Highway, turn right on the road to the ski valley. Continue past the ski valley, through a gate, and down a rough paved road. Drive to the gravel parking lot on the left just before the observatory. Park here and continue on foot, up the road, following the 'trail' sign. (Stay left when you see the sign at the observatory).
Ten minutes will bring you to a metal shed on the right hand side of the road. There is a spring here on the left...its probably safe, but drink at your own risk.
Continue past this shed for another couple hundred yards until you see a green transformer on the right. A trail will lead off left, downhill toward the crags. Five minutes on this trail will put you between the Ravens and the Fortress. Keep right and follow trail down to the back of the Fortress. At the back of the Fortress turn right (west) and follow the trail angling down to the obvious small crag.
The Classics
Mountain Project's determination of some of the classic, most popular, highest rated routes for Ravelin, The: