This paper presents experimental evidence confirming the existence of a damage zone in frozen soil, which is caused by propagation and connection of micro|cracks resulting in failure. The sizes of damage zones are evaluated via Mohr's and Maximum|Normal|Stress criterions, and the micro|crack damage zones are dealt with as equivalent cracks. Computing results show that equivalent cracks are basically the same as initial cracks in term of size, and the difference between computing and experimental result is within 10%.