Your best bet is to call/or go to your local Walmart and ask them. Each city/state will have different opening hours. They may also have something posted on their website about Black Friday hours and sales.
Most retailers will open between the hours of 4:00am-8:00am because they have "Door Buster" sales that end at certain times through out the day.
They open 6 am on black Friday
12 am Saturday
6:00
friday 8 o clock ath night
They open at 7 am
5a.m
7 am
5.00
never.........
It Opens At Midnight On Black Friday
8am
4 am