W.J.
I personally would stick to early evening. I think you would probably catch a lot of people off guard as it is always typically at night. That being said, if you have a lot of friends with young kids you could maybe arrange to trick or treat at just their homes...they may want to do the same thing with their kids if they are concerned about it at night. Unless I knew ahead of time, I would be needing to have them wait to go and find the candy if I had someone arrive in the morning. Good Luck!