Good question--I don't know. It's almost all gone today, either eaten or melted to the ground. I'll try to remember to go out this evening (when I'm willing to brave the outside again) and sniff the little bit remaining to see if it's rancid. Guess I'd better check the one in the front yard, too, even though it's completely shaded. With the official temps hitting 100+ for the last few days, shade doesn't help all that much.