genetics plays a part also. Some people who have penned deer say that certain bucks will shed the same day from year to year. But they are seperated from does and they are given a constant year round food source and arent allowed to run does all over the countryside all fall either like wild deer
My favorite time to look for sheds is when there has been about 4-8 inches of snow on the ground for 2-3 weeks in the end of february with no new snow on top. Those antlers just sit right on top of the snow. When it melts a little in the day then refreezes at night the antlers just sit right on top of the snow. plus if u don't see any deer tracks somewhere u don't have to spend the time looking there.