This invention provides a terrain system comprising a set of metal tubes having a rounded cross section The tubes are separated at a width that defines the appropriate terrain. The tubes are supported by a base located on at least two spaced apart positions therealong. Each leg assembly includes a bottom bar that allows it to be implanted in packed snow. Optional outriggers can be attached to each side of the bottom bar so that the legs can afford increased stability. The legs include telescoping sections that allow for height adjustability. One leg can be omitted, thereby creating a ramp. Each end of the top portion contains male and female connection points, which accommodate curved end caps. Two end caps can also be joined with a double-axis hinge assembly that allows the adjacent top portions to be joined together and articulated along two parallel hinge axes.