In certain embodiments, one or more Citizens Broadband Radio Service (CBRS) service devices (CBSDs) may be migrated from their current Spectrum Access System (SAS) to a new SAS, where at least one existing PAL or GAA spectrum grant is transferred from the current SAS to the new SAS without waiting for a timer associated with the existing spectrum grant to expire. CBSDs may be migrated one at a time or multiple CBSDs of a single service provider may be migrated in a single process where the multiple CBSDs are identified by a shared organization ID associated with the service provider. In either case, a migrating CBSD can continue to use its previously existing spectrum grants after migrating to the new SAS without significant delay.