depends on where your at... You could tickle some antlers together tomorrow and perhaps scare up a young buck (if that's what your looking for). Or maybe you'll spook something else... who knows. A real safe time is much closer to November when the sparring is heavy. If I'm counting on the rut in my area coming in mid Nov. I'll personaly not do anything serious with rattling until Nov.

But that's just me and my feeling about my local herd...