At least according to the photos I snapped last year in the area, it appears late September and very early October are the best times:
OCTOBER 2 (Chalk Creek Canyon):
http://www.autumn-pictures.com/october-fall-foliage.htm
SEPTEMBER 29 (Near Cottonwood Pass):
http://www.autumn-pictures.com/fall-foliage-pictures.htm
SEPTEMBER 28 (Near Cottonwood Pass):
http://www.autumn-pictures.com/autumn-foliage-photos.htm
SEPTEMBER 24 (Near Independence Pass):
http://www.autumn-pictures.com/independence-pass-foliage.htm
SEPTEMBER 19 & 21 (Near Cottonwood Pass):
http://www.autumn-pictures.com/fall-season.htm
Have fun and do give us a trip report afterwards!
-Steve
"I always wonder what folks in frozen lands will think when they discover that hell is full of grass yards that need mowing every day and heaven is a blazing desert." - Joel Smith
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