1 event in Pima County, Arizona
From big races to Saturday morning group runs—find marathon events and connect with the local endurance sports community.
Pima County
1 event in Pima County-
Sun, Dec 13, 2026 at 7:15 AMSee full details
SUNDAY, DECEMBER 13, 2026
Biosphere to Oro Valley, AZ
Net downhill courses along the foothills of the Santa Catalina mountains run since 1969. The full Marathon, 50K & Marathon Relay start at Biosphere 2 near Oracle and run down past Catalina, through Oro Valley and finishing at Pima Community College Northwest Campus. The full marathon has net elevation loss of 1,493 feet and is a Boston Qualifier with NO TIME PENALTY.
The Half Marathon starts at Golder Ranch Fire Administration in Catalina and runs down through Oro Valley, join The Loop Bike Path next to the Cañada del Oro to the finish at Pima Community College.
Join us for beautiful winter weather and a fast downhill courses!
Marathon & Marathon Relay Courses
The marathon runners line up at the spectacular and storied Biosphere 2 near Oracle, AZ running on some rolling hills until the course reaches Oracle Road / SR 77. Traveling along the majestic Santa Catalina Mountains, through the quaint towns of Catalina and then down into Oro Valley, the course brings the runners along the Canada del Oro River Bike Path to the new finish at Pima Community College Northwest Campus. For those who do not want to tackle the longer distances, the Marathon Relay requires four runners, each running a proportionate leg of the marathon course. (60 Team Limit)
Half Marathon Course
The Half Marathon now starts at Golder Ranch Fire Administration Building (former finish) and follows the second half of the marathon course into Oro Valley and along The Loop bike path. Both the Full and Half Marathon events are USA Track & Field certified and all results are sent directly to Boston.
50K Ultra Course
The 50 kilometer course is now USATF Certified and follows the Marathon course with a new addition extending to Ted Walker Park and back on The Loop bike path.
Packet
Packet Pickup
Friday, December 11, 2026
3:00pm - 6:00pm
Aravaipa Running
2401 S. 24th Street
Phoenix, AZ 85034
or
Saturday, December 12, 2026
11:00am - 6:00pm
Pima Community College -
North West Campus
7600 N Shannon Rd,
Tucson, AZ 85709
0000 North Oracle Road, Tucson, AZ 85704