Races
Salt Flats 100
Bonneville Salt Flats start. Thirteen miles of salt. Then the island peaks rise from white earth. Five thousand five hundred feet. Donner-Reed wagon tracks.
100 mi+1,487 ft-1,487 ft36 hours4,181 ft to 5,317 fttech 5/10Checkpoints per race bookBonneville Speedwayisland peaksbeginner friendlyMay
Distance100 mi
Gain+1,487 ft
Loss-1,487 ft
Altitude4,181 ft to 5,317 ft
Technicality5/10
Air40°F to 90°F
- Start4,196 ft
- High5,317 ft
- Low4,181 ft
- Finish4,196 ft
- Aid 1 at mile 6.3
- Aid 2 at mile 13
- Aid 3 at mile 19
- Aid 4 at mile 25
- Aid 5 at mile 32, cutoff 11 hours
- Aid 6 at mile 44
- Aid 7 at mile 57
- Aid 8 at mile 69
- Aid 9 at mile 82
- Aid 10 at mile 95
- Finish Wendover at mile 100, cutoff 36 hours
Terrain
Field, 2026 · 16-year samplescraped
Starters58
Finish rate66%
Median29:17
Sub-245
Geometryderived
Steepest drop459 ft-4.1% over 2.1 mi
Night miles38 misunset near 19:00 local
Weather at the cruxderived
At hour 10 of race, feels like 23 C (77 F).Sample of 7 race days, medium confidence.At hour 10 of race, apparent temperature P90 is 23 C / 73 F.
Course records
Men4:05:19Joshua Ducourant
Women19:12:18Steph Olson Whitmore
The cruxAid 5 hard cutoff at mile 31.6 by 6:00 pm Friday (near mile 65)
Course DNA
The Course
Salt Flats 100 runs 100 mi through Wendover, Utah. +1,487 ft gain and -1,487 ft loss. Surfaces skew 40% salt / 60% dirt road. Aid 5 hard cutoff at mile 31.6 by 6:00 pm Friday. High point near 5,317 ft. Low near 4,181 ft. May temps run 40°F to 90°F. The course rewards patience early and punishes rushed descents after mile 50.
The Work
Train for 1,487 feet of climbing across 100 mi. Back-to-back long runs on similar surfaces. Practice power-hiking grades above 15 percent. 36 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 5/10. Build a block that simulates the crux near mile 65.
Kit
May in Wendover, Utah: plan for 40°F to 90°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 36 hours pushes past dark. Poles help on sustained climbs above mile 25. Vest capacity for 2 liters minimum. Shoes matched to 40% salt: lugs for mud, rock plate if the course turns technical after mile 50.
Race Day
Hold effort through mile 25. The field often splits on the first big climb after mile 50. Aid 5 hard cutoff at mile 31.6 by 6:00 pm Friday near mile 65 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 33 miles of fatigue management. Finish with reserve for the last descent.
Results
Salt Flats 100 finish lines.
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Sources (3)
- Field stats (2026): https://ultrasignup.com/results_event.aspx?did=126588
- Course record (M): https://ultrasignup.com/results_event.aspx?did=47700
- Course record (F): https://ultrasignup.com/results_event.aspx?did=57601