Here is my experience, and I am not Johnny Appleseed.
I live at an elevation of 1400' amsl. The average terrain is about 1300', but the summit - 5 miles to the north is 1850' amsl. AMSL = Above Mean Sea Level!
The elevation from Pittsburgh to Ridgeway PA going north climbs about 100' per every 10 miles.
The average temperature in Pittsburgh is about 5* warmer then where I live.
The average temperature in the winter is about 5* colder then the high forecasted for Pittsburgh or Johnstown, PA.
Apple trees, on top of a summit tends to be less prone to frost than down in the valleys, even if the valley is higher then the average terrain, due to the fact that cold air falls while warm air rises.
This is the reason why apple trees on top of a higher elevation tends to fair better at times then apple trees at my house, even though my house is almost 200' higher in elevation than downtown Punxsutawney, or even the creek bottom below my house..
I've seen this the whole way up into Osewago NY in my travels.
Some places has really good apples, while other places has nothing but blight!
Even if you plant pears, you have to account for having to prune those trees to keep them from growing too tall and not producing any fruit.
We had pear, peach, apple, plum, cherry, black walnut, hickory trees in my mom's yard.
Before the blight killed most everything, it was common for everyone to have these trees.
Now all that is left is the apple trees and the black walnuts.
Chestnuts are almost non existent.
I would plant Chestnut trees and sour apple trees, the apples that are hard as a rock and doesn't turn until they have been frozen by frost or snow and are the last ones to fall off the trees. Some people will even plant Crab Apple trees, just to get a fruit that will last past the first week in October.
If you want to attract deer, you can't beat Sweet Corn...
I sat for a whole week - this week in a shed, and never saw a single deer, in a place where you couldn't load the gun fast enough to shoot all the deer in the field, if the field was planted in field corn.
I will say it again, deer are dumb animals. They eat, sleep, poop, breed and that is about it.
Just like people, if you give them a reason to come, they will come and refuse to leave as long as they are getting what they are looking for - as long as it is free!
You can't cut out all the brush, cover, else they will head to the cover the first time the gun goes bang or the wind is blowing and it is snowing.
Too many people makes the mistake of getting rid of the cover to plant food plots and make shooting lanes. When the area becomes too open, they will just go somewhere else during the daytime and come back at night - when you can't shoot them...
That is probably the reason why I saw so many deer tracks today coming out of the valleys, going to the tops of the ridges and back down into the next valleys.
I saw lot's of boot tracks in the woods and no drag marks in the snow.
Had I been at the top of the ridges between midnight and 6 AM this morning, I wouldn't have a pick up truck large enough to haul them all, or a can of powder big enough to keep loading my Muzzleloader to shoot them all..
I probably saw 100 deer tracks today and not a single deer!