There are three more accessible routes up the mountain, but be aware that all of these include an elevation gain of over 6,000 feet, so good physical condition is a must. Also, although an 8 hour return trip is possible, consider taking two days to do the climb and camp out on the mountain. The three routes all converge upon Avalanche Gulch for the push to the summit - Bunny Flat, Sand Flat and Old Ski Bowl are accessed from the paved Everitt Memorial Highway. Most of the area above treeline is incorporated in to the Mount Shasta Wilderness and is permit controlled. The permits are free and can be collected at ranger stations or self registered at trailheads.
Restrictions cover group size, camping areas, fires and hiking with dogs.