I’ve done pears under all sorts of conditions (late in April, early in may, right before 20F temps,…) and they did fine.
Do make sure to wrap securely in case of wind. Even when I’m tempted to just use parafilm I tie with a rubber.
I was a lot more careful with stone fruit. They like warm to callus so would wait until there’s a series of warm days or have a way of protecting them.