I'd saw 'em as soon as possible. That being said, this past fall I milled up some walnut that I had lying around in the yard for at least a year and a half

As I recall, the sapwood was not that much darker than a fresh log...there was still a nice contrast (I like sapwood in certain parts of furniture). I lost a couple feet from one of the walnuts cuz it was trying to split in half
They also debarked themselves as I was rolling them from their parking spot
