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Pruning can impact cold hardiness—but it’s less about the exact temperature and more about temperature variation. Generally, you don’t want to prune trees when there’s a risk of temperatures suddenly dropping from 50 to 60 degrees Fahrenheit to 0 degrees Fahrenheit or below. A tree is most sensitive until 48 hours after it’s pruned.

Dead trees are dangerous for several reasons. They are structurally compromised and prone to branch or trunk failure, which can pose a significant safety risk to people, vehicles, and nearby structures. Dead trees can also harbor pests like termites, which may spread to other trees or your home. If a tree died from a disease, it could spread the illness to healthy trees. Additionally, the dry wood is highly flammable, increasing fire risk.

Generally, avoid trimming trees in the summer (with the exception of pruning fruit trees as needed). Trees use a lot of energy in the summer, most of which is relegated to new growth. If you chop it too early, you could stunt the next season's growth. Again, when in doubt, do some research based on the specific tree type.

After a big storm, you may not be sure if a tree was struck or not. Look for the telltale long scars, like strips or gouges in the bark of the tree, running in sometimes jagged lines down the length of the trunk. These scars will often show vulnerable living wood inside the tree. It’s also common to see scorched or wilted leaves on the side or top of the tree where lightning struck.