While it's technically possible to prune year-round, late winter and early spring, while trees are still dormant, is the perfect time to prune fruit trees. Whether the goal is maximum fruit production or shape aesthetics or 'releasing' an old/wild tree from surrounding trees, pruning before bud break will put the tree in the best place to energetically benefit from the pruning. This means that once the tree begins to allocate energy and produce new growth in late spring, the tree will send those energies to zones that are intentioned by the savy pruner.
Emerald Tree Experts will gladly come and prune your fruiting trees --apple, peach, pear, plum, etc-- or offer consultation. There are also a number of great resources out there to guide you if you are a DIY pruner! Here are a few:
http://modernfarmer.com/2015/02/right-cut/
http://umaine.edu/fruit/growing-fruit-trees-in-maine/pruning/
http://www.groworganicapples.com/organic-orcharding-articles/how-to-prune-apple-tree.php
http://www.gardening.cornell.edu/education/mgprogram/mgmanual/07pruning.pdf
http://chemung.cce.cornell.edu/resources/pruning-apple-trees
https://anrcatalog.ucanr.edu/pdf/8502.pdf
Emerald Tree Experts will gladly come and prune your fruiting trees --apple, peach, pear, plum, etc-- or offer consultation. There are also a number of great resources out there to guide you if you are a DIY pruner! Here are a few:
http://modernfarmer.com/2015/02/right-cut/
http://umaine.edu/fruit/growing-fruit-trees-in-maine/pruning/
http://www.groworganicapples.com/organic-orcharding-articles/how-to-prune-apple-tree.php
http://www.gardening.cornell.edu/education/mgprogram/mgmanual/07pruning.pdf
http://chemung.cce.cornell.edu/resources/pruning-apple-trees
https://anrcatalog.ucanr.edu/pdf/8502.pdf