The shades of yellow or red appear naturally which is hard to miss.
This gives off a feeling as if the tree is suffering. A mature maple tree can be pruned in winter. However, if the tree is just a sapling or in a growing stage then loss of sap can be a problem. Thus, the best time to prune maple trees is around early spring or late winter.
Before they bloom in the spring, you should ideally get them pruned.

The Best Time to Prune Maple Trees. Maple trees are deciduous trees that are dormant in winter. Most trees are pruned during this dormant period. But maple trees bleed when they are cut during the winter and spring. For this reason, the best time to prune maples is during the summer months.
what is the best time of year to trim a maple tree? When to Prune Maple Trees Pruning should be done in late winter or early spring. Pruning maple trees during the dormant season will help your trees with new growth in the spring when they bloom. You can also prune in the summer if you want to slow the growth of certain branches.
You may ask, How do you keep a red maple tree small? Tree trimming can be done in any season even when the tree is in its dormant cycle, but in most cases, the best time to trim trees is in the Winter. The same goes for most other plants that you are likely to have in your landscape, so the best time to prune trees and shrubs is also in the Winter.