Abstract: An equestrian barrier having a standard, a jump cup that can be adjusted to various positions along the standard, and a pole supported by the jump cup. The standard has notches formed at intervals therein. Each notch is defined by a lower arcuate surface. An end of the jump cup has a corresponding curved surface. When the end of the jump cup is received in one of the notches, the pair of curved surfaces oppose each other and the torsional component of gravity tends to seat an upper surface of the jump cup against an upper surface of the notch. A bracket can be provided to increase stability by engaging a groove formed on an opposite side of the standard.