I am not from Wisc but I dd check the website for you.
Seems to me you must register the deer by 5:00PM on the day AFTER it was killed.
Non-CWD Unit Deer Registration
•
Deadline: All deer killed by firearm hunters (including muzzleloader deer
season)
must be registered no later than 5:00 p.m. of the day after the close of the
season in which the deer was killed. All deer killed by archery hunters must be
registered no later than 5:00 p.m. on the third day after the deer was killed or by
5:00 p.m. the day after the season closes, whichever occurs first.
•
Location: All deer killed must be registered in the unit of kill or in an adjoining unit.
CWD Unit Deer Registration
•
Deadline: All deer killed must be registered no later than 5:00 p.m. on the day
after it was killed.
•
Location: All deer killed in the CWD Management Zone must be registered
within the unit of kill or adjacent unit of kill within the CWD Management Zone