Sorry to be the Scrooge…but seeing mistletoe hanging from your trees is NOT a good thing.
Mistletoe is a parasite with a root system that penetrates trees and sucks out water and nutrients. Infected areas are certain to die, and need to be dealt with by removing infected branches.
Mistletoe will not completely kill your trees overnight, but it will kill infected areas and can significantly shorten a trees life span.
Removing infected branches will also keep it from spreading to other parts of the tree, or to other trees on your property. Mistletoe spread by seeds which are typically carried by birds or squirrels, so the sooner you get rid of it the better.
Mistletoe is also a sign of potential health issues in your trees. Mistletoe does not attack healthy, thriving trees. It could be a number of different things like a lack of water, disease or insect infestation. Just know that if you have mistletoe, you may need to take a closer look to figure out why.