Great info guys. It sounds like in general, earlier is better and I can just get up earlier and get out there on sun-up. If it's a day trip, I'll probably leave by mid-afternoon and miss the evening times but if I do an overnight trip, then I'll take the opportunity to hit the evening time.
I can't say on my trips that earlier has been better and sounds like sparkchaser had better luck later in the morning, but perhaps he just hit the right spot.
Thanks for the info.