Oh ok, I'll look for that. It is very dry up there in spite of recent rains.
I found this article.
http://www.thedenverchannel.com/news...10/detail.html
ASPEN, Colo. -- Leaves from Rocky Mountain National Park to Silverton started turning yellow in mid-August this year. Chris Forman, Aspen's city forester, says the yellow leaves could indicate stressed trees and could mean an early and shorter color season.