by 
The Curious Bag
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<h4 class="dechead">On One Hand: Finish the Deck
According to Real Cedar, the industry trade group of the Western Red Cedar Lumber Association, cedar lumber is naturally durable and is, therefore, suitable for outdoor decks. Even with these qualities, the lumber should be finished, or sealed, to repel water and preserve the wood. Information on Real Cedar's website, Cedar-Deck.org, says decks should not weather, or age, prior to the application of a finish or sealant.
On the Other: Let it Age One Year
The old-school of thought on cedar decks was to allow them to age or weather for one year. This is still a common question on home improvement forums and websites. Aging the wood was thought to bring out a more pleasing color. It also relied on cedar's natural durability to avoid damage during the time it is unprotected.
Bottom Line
The bottom line is cedar decks should be finished as soon as possible. The change in color that occurs if the deck is left unfinished is actually a sign of decay or moisture content in the wood. Neither is good.
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