The spontaneous reorientation of the weak ferromagnetic moment (``temperature‐induced spin flop'') in the rare earth orthoferrites is found to take place over a well‐defined temperature range. In TmFeO3, this range is 12°K wide and centered at 88°K. Susceptibility peaks have been observed at the ends of this temperature interval where the magnetic easy axis just begins to rotate away from theaorcaxis.