Below about 3500 feet you will see them. Most of the climbing at this elevation is done during the winter months when it is colder. You can still climb this low if you can stay in the shade even as spring turns to summer.
Brian K took the photo, but I had to rotate it back to show the actual angle of the crag. He always rotates the camera in response to some inner urge to have the cliff face be perfectly rectilinear in the frame. Luckily the saguaros (and QDs) show the true angle, so it's easy to rotate it back.