Abstract: A horse jump system and jump cup assembly defined by rotatable and releasable jump cups, wherein the system includes a pair of opposing posts having key hole tracks vertically disposed, at least one pair of rotatable jump cup assemblies for mounting to the pair of key hole tracks and at least one pole removably positionable in said jump cups. The jump cup assembly includes a jump cup support mount or coupling that is adapted for removably mounting to the key hole tracks and jump cup adapted for releasably and rotatably mounting to the coupling wherein the jump cup support coupling and jump cup have cooperating interlocking structure, namely an open-ended arcuate channel and corresponding tab that forms a snap fit with the channel. The jump cup is dislodged from the coupling when urged by a predetermined force having vertical and, or horizontal components.