I duck hunt in the foothills of California sometimes, and the last two years, I hear birds gobbling pretty good starting in mid-December. This past January, I took out a turkey call just for fun, and the birds really responded to it.
Toms and hens seemed to be grouped up together, and I have been really surprised by the amount of gobbling I hear (as well as the hen vocalizations) so long before the breeding season. These are Rio turkeys...