Thanks, rotuts! Our trees are fairly young and don't produce a ton of fruit, but enough for us to enjoy. The fruit is ready to eat in November and they don't usually stay on the tree past December because I eat them all!!! We have a tangerine tree that makes luscious juice, very sweet and clear, a Cara Cara orange that didn't produce much this year and two red grapefruit trees.
I remember having a few of those Golden Nature Guides when I was a kid! Great series:
http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=golden+nature+guide
Sabino Canyon is pretty popular these days, lots of people there at times!