Trail
50 mile loop
80.5 km
Start: Jan 3, 12:00 PM
Old Pueblo Endurance Runs
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Trail in United States, Sonoita
Distances
Trail
25 mile loop
40.2 km
Start: Mar 8, 01:00 PM
About
One of the oldest trail ultramarathons in Arizona, set in the scenic Santa Rita Mountains with starts at the historic Kentucky Camp mining site.
Catering & aid stations
Water, electrolyte drink, potatoes, oranges, bananas, chips, M&Ms, pretzels, PB&J sandwiches, Coke, V-8, and soup available at aid stations. No electrolyte tablets provided.
Pacers
Pacers are allowed for 50-mile runners aged 60 and older on the second loop. Pacers must check in and start their pacing duties at Kentucky Camp at the race start.
Typical weather in Sonoita
Monthly averages based on historical data (2000–present).
Jan57°35°
↑ 07:24
↓ 17:42
Feb59°37°
↑ 07:06
↓ 18:10
Mar65°41°
↑ 06:33
↓ 18:32
Apr73°47°
↑ 05:54
↓ 18:53
May81°55°
↑ 05:27
↓ 19:14
Jun90°65°
↑ 05:18
↓ 19:31
Jul87°68°
↑ 05:29
↓ 19:30
Aug85°66°
↑ 05:49
↓ 19:07
Sep82°62°
↑ 06:08
↓ 18:30
Oct75°53°
↑ 06:27
↓ 17:51
Nov65°44°
↑ 06:53
↓ 17:25
Dec58°37°
↑ 07:17
↓ 17:22
Route maps
What's included in entry
- Support included
- Aid stations
- Drop bags
- Finisher medal
- Event shirt
FAQ
What are the time limits?
25 mile: 7 hours; 50 mile: 15 hours. All 50-mile runners must complete the first loop by 1:00 PM.
Are drop bags allowed?
Yes, drop bags are permitted at all aid stations for 50-mile runners and must be placed in the designated bins with name, aid station, and bib number.
Is crew access allowed at all aid stations?
No, crew access is not allowed at Melendrez Pass aid station; runners will be disqualified if crew is present there.
Last updated: Jun 5, 2026, 11:37:29 PM
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