Thanks, there are several pressure treated posts and filler pieces too (just to make things more complicated). I will call the manufacturer and see what they have to say.

Do you think it will go silver between now and the end of the summer? How long does that effect take?

Not sure how long that will take. I used a solid color stain by Olympic on a fence I built last summer out of pressure treated pickets because the stain said it could be put on fresh pressure treated wood. Check a can of it before calling the Mfg. should have all the info on the can.

Dave, I hear the same conflicting stories regarding when to stain or seal a new cedar deck.
I went ahead and did it sooner because allowing it to weather gray usually involves more work cleaning/restoring it back to the natural wood color.

I won't try to sway you on which products to use, but please avoid HomeDepot. Choose a quality product from a paint store, i.e. Sherwin Williams.

Since I first responded to this post I have replaced about 300 ft of picket fence and have rebuilt my deck. I only use Behr solid color stain. The highest quality they sell at home Depot . I stained all the cedar pickets before installing them. I put on 2 coats. Some of the fence has about 5 years on it and it still looks as good as the day I installed it. I purchased a report on wearibility of stains from a syndicated home improvement columnist who did tests on different brands and Behr solid color came out on top. But I already knew that from my experience.