Fatigue crack growth characteristics and crack closure for an A 508-3 steel were investigated at elevated temperatures (150°C and 288°C). The results obtained are summarized as follows: (1) The occurrence of oxidation of crack surfaces at elevated temperatures can affect the formation of fretting oxide debris in fatigue crack growth and has an important role on the near-threshold characteristics. (2) It can be possible to exclude the contribution due to fretting oxide debris and oxidation at elevated temperature on the near-threshold characteristics by the selection of a moderate test temperature. In this case, the characteristic is controlled only by plasticity induced crack closure and becomes a structure- and enviroment-insensitive material constant.