Takin' it to the trails Answer the call of fall Doug Kreutz Sep 29, 2011 Desert dwellers: This rare object seldom seen on the desert floor is a leaf that has changed color and fallen along the Aspen-Marshall Gulch Loop. Doug Kreutz As featured on +4 Takin' it to the trails: Answer the call of fall Summer: It's over. Extreme heat: outta here. Hiking conditions: just about perfect. Autumn in the Tucson area can be near nirvana for trail trekkers - with almost all of our desert, canyon and mountain terrain free from climatic extremes.