What time does Halloween begin- when do people start passing out candy and going outside?

Well Halloween is on the 31st of October, so it starts then. But I'm guessing you mean what time of the day. It's mostly the kids that trick or treat so it usually starts a few hours after school. So between 4 and 5 is the time when it mostly starts. So that is pretty much is the same as for passing out candy to.

I think that people start around 6 o clock