When determining how long your wooden fence will last, there are many factors to consider: ●   The natural life of the wood used to construct your fence is one factor that will determine how long your fence will last. For example, some cedar products can last anywhere between 15 and 30 years, while spruce has a shorter lifespan of up to 7 years. ●   If the wood is treated, it will last longer. ●   The longevity of your fence also depends on the installation method. For example, if your fence comes in contact with the ground, it will be more exposed to moisture, which can damage it. ●   A wooden fence will also last longer if you take care of it properly. That means that you need to look for rot, cracks, splits, and other forms of damage and fix these issues before the problem expands.