California Photographer has the following fall color report for Napa Valley
The valley is awash in soft yellows and golds now as almost all vineyard tracts have turned from green. Up-valley vineyards (St. Helena & Calistoga) have some individual vines turning crimson and purple, and mellow reds are developing mid-valley (Rutherford, Oakville & Yountville) as well. However, no wide-spread brilliant oranges, reds or purples yet; mostly gold for now.
To see more reports go to: California Photographer
Natural History Wanderings 
Thanks very much for report. I am planning to visit on week after Thanksgiving and hopping that fall will be on pick time around that time..
When will be your next report for Napa?
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By: JM09 on November 16, 2012
at 11:38 AM
I post reports as I become aware of them. You might also follow
California Fall Color: http://www.californiafallcolor.com and
California Photographer blogs: http://calphoto.blogspot.com
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By: Sandy Steinman on November 16, 2012
at 11:41 AM