It needs time to recover!
Apr 30, According to experts at Michigan State University Extension, the normal time-tested advice to prevent oak wilt is to not prune oaks after April 1, otherwise you risk injuring oaks.
While risk of infection decreases after mid-July, it’s prudent to avoid pruning any type of injury of these majestic trees until bushleaning.clubted Reading Time: 4 mins. Oak trees need pruning from time to time for many different reasons, so when is the best time to prune them? When should oak trees be pruned?
During the dormant season in the winter. After leaves have fallen off but before the active growing season. Dead of winter is best when there isn’t sap running yet. While you can prune trees anytime there are best times and worst times to do bushleaning.clubted Reading Time: 7 mins.
Aug 10, Probably the best time from the standpoint of the health of a plant is to prune in late winter or early spring just before new growth resumes for the year. However, there are exceptions depending on when a plant flowers or other characteristics (such as sap “bleeding” on maples) that may require pruning at other times of the bushleaning.clubted Reading Time: 5 mins.
Sep 26, Oak trees are best trimmed in the winter between November and March. Oak trees are dormant in winter and are less likely to be negatively affected by pruning when in winter dormancy.
That being said, branches which are dead, damaged, or diseased should be removed any time of year (and as soon as possible).Estimated Reading Time: 8 mins.
Aug 27, A: Indeed, the time to trim oaks is when the tree is dormant. Generally this is between late October and March, but I'd wait well into November to prune and finish up by mid-February - Estimated Reading Time: 3 mins.

Pruning the oak tree in winter gives it enough time to heal its wounds and recover quickly in the salubrious month of spring. Another reason for pruning the oak tree in winter is that it reduces the chance of oak wilt infection. Oak wilt is an infectious fungal disease that can spread to other healthy oak trees by way of sap-feeding beetles.