If the lower elevation is pine, the higher elevation should be as well. Pine is a cold weather tree, oak and maple are warmer weather.
Well, do to some lore related magic that I don't want to disclose, both of these areas are rather warm year-round. It hasn't snowed in these areas in 400 years. Now, there are specifically snowy areas, but those will either have pine trees or no trees at all. There should be no snowy places with Oak, Maple, or Birch; and if there are, they will be dead.