Mount Lemmon Post Office, 12984 N Sabino Canyon Parkway — Retail operations have been temporarily suspended due to wildfires. Alternate retail location is Fort Lowell Post Office, 6460 E. Grant Rd. Tucson, 85715. Hours of operation are Monday through Friday, 8:30 a.m. to 5 p.m. and Saturday, 8:30 p.m. to 3 p.m.