Fading. If you leave cedar wood untreated, it will not succumb to the devastating effects of mold, rot and insect damage. However, it will lose its typically golden-brown color.

How long do cedar boards last?

Most carpenters figure a lifespan of 15 to 20 years for cedar wood deck boards, but it can deteriorate faster when used for ground-level decks and for shaded decks that are slow to dry out. To retain the color, you have to clean it and reseal it every year or two, and even then it's a losing battle.

How long do cedar boards last outside?

In outdoor structures that are not in contact with the ground, such as decks, gazebos, pergolas and fence boards, cedar may last 30 years or longer. When in contact with the ground, such as when it's used for fence or support posts, it can last between 15 and 20 years.