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The diesel particulate filter (DPF) is effective for particulate removal from diesel engine exhaust under a variety of conditions, but development of regeneration strategies remains an ongoing challenge, primarily because of low exhaust temperatures. This paper addresses two issues related to DPF regeneration: the thermal response of DPFs during regeneration events and the soot oxidation (i.e., regeneration) rate at varying temperature, flow rate, oxygen content, and unsteady inlet temperature. The experiments are performed in a laboratory reactor, which provides gas temperature and composition similar to diesel engine exhaust. The catalyzed and uncatalyzed DPFs used in this study are first loaded with soot on an engine dynamometer at a fixed load and engine speed. During constant temperature regeneration experiments, the change in pressure drop is monitored to determine the extent of regeneration.