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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.

If an arborist is certified by the International Society of Arboriculture (ISA), the highest level of certification available is ISA Board Certified Master Arborist. According to the ISA, this credential is reserved for arborists “who have reached the pinnacle of their profession.” Check your arborist’s credentials before hiring to confirm their level of training and expertise.

Although the terms tree trimming and tree pruning are used interchangeably, they are very different types of tree maintenance. Tree trimming involves enhancing the appearance of your tree by removing unruly branches, providing your tree with ample sunlight and nutrients and prevents unsightly overgrowth. 

Tree pruning helps keep your trees disease-free. This process removes unhealthy growths, dead branches, and other unhealthy parts of the tree. It’s more common for deciduous and ornamental trees but not so common for evergreen trees. To determine which method you need, discuss it with a tree trimming specialist.

Consumers typically do not need to worry about the cost of tree insurance, as professional tree service companies pay for their own coverage. For a tree service business, an average U.S. policy covering about $1 million in general liability costs roughly $40 a month or $500 a year. More extensive policies, providing between $500,000 to $2 million in coverage, can cost between $3,000 and $6,000 annually, depending on the company's size and scope of work. Tree service professionals should speak with an insurance company to determine the right plan for their business.