The Cryogenic Underground Observatory for Rare Events (CUORE) is a Ton - scale Neutrino - less Double Beta Decay experiment that uses 998 TeO 2 crystal bolometers that need to be operated at a baseline temperature of around 10 mK. The large volume and masses involved require a dedicated precooling system that allows the apparatus to reach a threshold temperature after which the Dilution Unit, a mK - scale refrigerator, ca n start the final cool - down. The CUORE Fast Cooling System (FCS) has been developed, constructed and recently used for the CUORE precooling stage. It mainly consists of a cryostat with heat exchangers that use 3 Gifford - McMahon refrigerators, a He blower, a filtering module and several sensors that allow to monitor and control the system during this very delicate cooldown procedure. The present work describe s the FCS and summarize the FCS performances during the fir st full CUORE detector cooldown.