The Mount Shasta area has a variety of campgrounds. Most of these facilities are operated by the National Forest Service. They range from high elevation sites adjacent to alpine lakes to campgrounds on the banks of the Sacramento and McCloud Rivers. Two campgrounds are on the flanks of Mount Shasta itself.
Dispersed camping is also permitted throughout the national forest. Email me at bubba(dot)suess(at)hikemtshasta.com for specific dispersed camping recommendations!