A system for freezing a portion of ground comprising at least one probe having at least one end insertable in the ground to be frozen and having at least one lateral wall, supply means of a cryogenic liquefied gas connected to the probe to supply the cryogenic liquefied gas to the same probe, said supply means comprising a dispensing device of said cryogenic liquefied gas placed on the inside of the probe, wherein said dispensing device is spaced from said end insertable in the ground in such a manner as to spray said gas directly onto said lateral wall of said probe, characterized in that said dispensing device has a dispensing mouth via which the cryogenic liquefied gas may be sprayed onto the lateral wall 14 of the probe 3, above a liquid head generated by the cryogenic liquefied gas present inside the probe 3 at the first end 13a, in that said probe has a tubular conformation closed at said insertable end to contain the cryogenic liquefied gas, said probe extending along a longitudinal axis X, said probe being insertable in the ground in such a manner that the longitudinal axis X is arranged vertically, in that said probe is provided with a suction pipe, said suction pipe being at least partially placed on the inside of the probe, extending at least partially parallel to the longitudinal axis X and having at a first end of said suction pipe on the inside of the probe a suction mouth, in that said probe has a distance (h) defined between the suction mouth of said suction pipe and said insertable end of the probe which greater with respect to a distance defined between said dispensing device and said insertable end of the probe, and in that said probe comprises a sleeve 13 having a layer of insulating material placed externally to the sleeve and adhering to the same sleeve, inside which the cryogenic liquefied gas, is introduced. wherein said dispensing device is spaced from said end insertable in the ground in such a manner as to spray said gas directly onto said lateral wall of said probe, characterized in that said dispensing device has a dispensing mouth via which the cryogenic liquefied gas may be sprayed onto the lateral wall 14 of the probe 3, above a liquid head generated by the cryogenic liquefied gas present inside the probe 3 at the first end 13a, in that said probe has a tubular conformation closed at said insertable end to contain the cryogenic liquefied gas, said probe extending along a longitudinal axis X, said probe being insertable in the ground in such a manner that the longitudinal axis X is arranged vertically, in that said probe is provided with a suction pipe, said suction pipe being at least partially placed on the inside of the probe, extending at least partially parallel to the longitudinal axis X and having at a first end of said suction pipe on the inside of the probe a suction mouth, in that said probe has a distance (h) defined between the suction mouth of said suction pipe and said insertable end of the probe which greater with respect to a distance defined between said dispensing device and said insertable end of the probe, and in that said probe comprises a sleeve 13 having a layer of insulating material placed externally to the sleeve and adhering to the same sleeve, inside which the cryogenic liquefied gas, is introduced.