Like others that posted definitively a canyon tree frog. Really the only type of tree frog living in your area. Out of al the reptiles & amphibians I collected and kept over the years, tree frogs are my favorite. I had a few aquariums with them and if you shake a bag of crickets into it they will jump across from one side to the other, catching the crickets before they even hit the ground. They will eat anything that moves that they can shove in their mouths. Great for eating local insects.
I first encountered them in Zion National Park. Had no idea tree frogs even inhabited the arid southwest. Like another poster said, tree frogs are like spider man and can climb and stick to anything.
Easiest way to tell the difference from toads and regular frogs is that only tree frogs have the large suction cup like discs on their toes.