Because fig trees derive from the Mediterranean, those planted in cooler climates require frost protection during winter months, explains Gardening Know How. At the end of the growing season, prune weak and sick branches less likely to survive the winter that may pull energy away from healthier parts of the tree. Then wrap the tree.
Using burlap, wrap the outside of the tree in multiple layers, leaving a space at the top to accommodate air flow and prevent moisture buildup. Using a sturdy material, such as chicken wire, construct a cage around the burlap-encased tree. Fill it with a non-compact material, such as straw, leaves or wood chips. Wrap the entire tree, including the top, with plastic, and place a hard-plastic object, such as an upside-down bucket, on the top of the tree to protect it from cold temperatures.
Do not remove the protections until the danger of frost has passed and spring temperatures do not drop below 20 degrees Fahrenheit. In addition to using this winterizing method, fig trees in mobile pots can instead spend the winter in an enclosed, cool, dry place, such as a garage or cellar. Water the tree no more than once a month. Move potted trees back outside when temperatures remain higher than 35 degrees Fahrenheit at night.