You should not trim an oak tree in the summer. Oak trees are especially susceptible to disease, and open tree wounds are an invitation for beetles that carry tree-killing fungus. If there’s no risk that the oak tree will do damage to your property or hurt someone, it’s best to save the trimming for fall or winter. If you can, seal the wound with latex to prevent fungus from getting inside.

Once you confirm a tree is dead, you should remove it. Dead trees eventually fall, and larger trees in particular can cause damage to rooftops, fencing, flowers, and other objects. As we mentioned, letting decayed wood stay in your yard also invites risks to the surrounding landscaping and vegetation.

Common signs that a tree is rotting include dead branches, a leaning trunk, peeling or cracked bark, leaf discoloration, and the presence of fungi. If you notice any of these signs, it’s best to hire an arborist near you to inspect your tree and determine if it can be saved or if it needs to come down.

We don’t recommend DIY tree trimming for a few different reasons. First, the tools required to trim a tree can be costly, up to $1,100 or more, for the ladders and specialized saws needed. 

Safety is another concern, especially when working with more mature trees. As a guideline, you should only DIY tree trimming when branches are less than two inches in diameter. Any more, and the safety risk becomes too high, which could lead to catastrophe. For this job, it’s safest to let a tree-trimming professional assess the work needed.