Four different temperature regimes can be distinguished in flux‐creep relaxation‐rate data on many high‐temperature superconductors: 1) the ultralow temperature region where initial results show a temperature‐independent relaxation suggesting vortex tunneling, 2) a low‐temperature region where the relaxation increases linearly with temperature in agreement with conventional flux creep theory, 3) an intermediate region where the normalized relaxation rate becomes constant, as suggested by a vortex glass or collective pinning model, and finally 4) a high‐temperature region near the irreversibility line, where experiments are still inconclusive.