Well October is a great time to visit AZ. But I would visit the Northern and Eastern areas. Examples: From Phoenix or Tucson go to Clifton and Hwy 191 (525 switchbacks in 100 miles) one of my world favorites! Hwy.260 across the White Mtns. is beautiful and so are the little towns it driffs through. Hwy.60 between Show Low and Globe, 188 to Payson and 87 up to Flagstaff and 180 to Grand Canyon all spectacular. 89A from Flagstaff to Sedona and Jerome to Prescott, and 89 on to Wickenburg are all fun roads. As previously mentioned, Tombstone and Bisbee, Tubac and even Tucson are all good visits, though warmer. The High country is 2300 meters, and can get snow in later Oct. temps 0-18 C, but the deserts are still very warm, up to 37C! The mountain dividing line is N of Prescott, Camp Verde, Globe.