The answer to 'why is my fence bare spots' is that there are several common causes, including sun damage, weather exposure, and lack of maintenance. Bare spots on a fence can be caused by the wood drying out, rotting, or becoming damaged over time due to UV rays, rain, snow, and other environmental factors.
Some other possible reasons for bare spots include insect damage, mold or mildew growth, and improper installation or materials. If the bare spots are localized, it may be a sign of a specific problem like a loose board or a spot that wasn't properly sealed. In most cases, the solution will involve repairing or replacing the damaged sections of the fence.