Races
Flagstaff Sky Peaks 50 Miler
Arizona Snowbowl start. Agassiz Loop to 11,500 feet in the first 3.4 miles. Then high-country AZT under aspen and pine. Arizona's highest footrace.
50 mi+7,387 ft-7,377 ft15 hours7,310 ft to 11,481 fttech 6/10Checkpoints per race bookAgassiz LoopArizona SnowbowlUTMB IndexSeptember
Distance50 mi
Gain+7,387 ft
Loss-7,377 ft
Altitude7,310 ft to 11,481 ft
Technicality6/10
Air25°F to 65°F
- Start9,551 ft
- High11,481 ft
- Low7,310 ft
- Finish9,560 ft
Terrain
Field, 2025 · 9-year samplescraped
Starters68
Finish rate90%
Median12:04
Sub-2461
Geometryderived
Steepest drop1,916 ft-17.2% over 2.1 mi
Night miles5 misunset near 19:00 local
Time over 10k ft6%
Longest climb2,251 ft25 mi at 1.7%
Weather at the cruxderived
At hour 7 of race, feels like 24 C (80 F).Sample of 7 race days, medium confidence.At hour 7 of race, apparent temperature P90 is 24 C / 76 F.
Course records
Men7:18:07Scott Traer
Women9:05:48Katalin Nagy
The cruxAgassiz Loop at mile 3.4, 11,500 ft before 46 miles remain (near mile 33)
Course DNA
The Course
Flagstaff Sky Peaks 50 Miler runs 50 mi through Flagstaff, Arizona. +7,387 ft gain and -7,377 ft loss. Surfaces skew 90% trail / 10% doubletrack. Agassiz Loop at mile 3.4, 11,500 ft before 46 miles remain. High point near 11,481 ft. Low near 7,310 ft. September temps run 25°F to 65°F. The course rewards patience early and punishes rushed descents after mile 25.
The Work
Train for 7,387 feet of climbing across 50 mi. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 15 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 6/10. Build a block that simulates the crux near mile 33.
Kit
September in Flagstaff, Arizona: plan for 25°F to 65°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 15 hours pushes past dark. Poles help on sustained climbs above mile 13. Vest capacity for 2 liters minimum. Shoes matched to 90% trail: lugs for mud, rock plate if the course turns technical after mile 25.
Race Day
Hold effort through mile 13. The field often splits on the first big climb after mile 25. Agassiz Loop at mile 3.4, 11,500 ft before 46 miles remain near mile 33 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 17 miles of fatigue management. Finish with reserve for the last descent.
Results
Flagstaff Sky Peaks 50 Miler finish lines.
Official siteBack to racesPredict your timeTrain for this raceCheck readinessFoot care plan
Sources (2)
- Field stats (2025): https://ultrasignup.com/results_event.aspx?did=120813
- Course record (M): https://ultrasignup.com/results_event.aspx?did=103843