Embodiments are provided for audio synchronization of one or more playback devices using offset information. In an example embodiment, a first device receives, from a second device, data representing a first time, the first time corresponding to first audio data to be played by the first playback device as part of a synchrony group with the second device. The first device determines a second time based on (i) the first time and (ii) a first offset between a clock of the first device and a clock of the second device. The first device plays the first audio data at the second time according to the clock of the first device. After playing the first audio data, the first device determines a second offset between the clock of the first device and the clock of the second device and replaces data representing the first offset with data representing the second offset.