Yes, you can prune fruit trees in summer but you need to keep the cuts light. Summer pruning works well for controlling size, removing water sprouts, and letting more light reach ripening fruit. Just don't cut as much as you would during the dormant season.
I use summer fruit tree pruning on my apple trees every year now. They grow so fast in my fertile soil that they would take over the whole yard without mid-season cuts. A few sessions with the loppers in June and July keeps them at a size I can manage and harvest from without a tall ladder.
My peach trees taught me the best reason to prune in summer. I noticed the fruit on the inside branches stayed pale and soft compared to the outer fruit. One year I opened up the canopy in early July. The fruit color improved and the peaches ripened more even across the whole tree.
Summer pruning slows your tree down because you remove leaves that make food. Each leaf works like a tiny factory turning sunlight into sugar. When you take off branches in full leaf, you reduce the energy your tree can store for next year. This is why summer cuts help control overly vigorous trees.
Water sprouts make the best targets for warm weather tree trimming. These fast growing shoots pop up from branch tops and inside the canopy all summer long. They crowd out fruiting wood and block light from reaching your fruit. Snap them off when they are small and soft or cut them at the base when they get woody.
Opening up crowded areas helps air move through your tree. Good airflow dries leaves fast after rain and cuts down on fungal diseases. You will see less brown rot on stone fruits and fewer apple scab spots when breezes can blow through the branches.
Keep summer cuts to no more than 10-15% of the total canopy. Save heavy pruning for the dormant season when your tree won't miss the lost leaves. Think of summer work as fine tuning rather than major shaping.
Avoid pruning when your tree shows drought stress. Wilting leaves and dry soil mean your tree already struggles. Cutting branches at that point makes the situation worse. Water your tree well for a few days before you pick up the pruners if the weather has been hot and dry for a while.
Read the full article: Pruning Fruit Trees: A Complete Guide
