Races
Dinosaur Valley
Glen Rose, Texas. Hill Country rock. Two fifty kilometer laps. Six thousand six hundred feet per hundred k.
63 mi+3,273 ft-3,469 ft22 hours1,037 ft to 1,234 fttech 5/10Checkpoints per race bookGolden Ticket racetwo lapsWSER qualifierNovember
Distance63 mi
Gain+3,273 ft
Loss-3,469 ft
Altitude1,037 ft to 1,234 ft
Technicality5/10
Air40°F to 85°F
- Start1,234 ft
- High1,234 ft
- Low1,037 ft
- Finish1,037 ft
Field, 2025 · 9-year samplescraped
Starters258
Finish rate88%
Median17:32
Sub-24212
Geometryderived
Steepest drop128 ft-1.1% over 2.2 mi
Night miles25 misunset near 17:00 local
Course records
Men9:58:18Meng Zhao
Women11:01:01Aimee Warnke
The cruxDouble 50k lap on rocky Hill Country trail (near mile 40)
Course DNA
The Course
Dinosaur Valley runs 100 km through Texas. +3,273 ft gain and -3,469 ft loss. Surfaces skew 80% trail / 20% dirt road. Double 50k lap on rocky Hill Country trail. High point near 1,234 ft. Low near 1,037 ft. November temps run 40°F to 85°F. The course rewards patience early and punishes rushed descents after mile 31.
The Work
Train for 3,273 feet of climbing across 100 km. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 22 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 40.
Kit
November in Texas: plan for 40°F to 85°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 22 hours pushes past dark. Poles help on sustained climbs above mile 16. Vest capacity for 2 liters minimum. Shoes matched to 80% trail: lugs for mud, rock plate if the course turns technical after mile 31.
Race Day
Hold effort through mile 16. The field often splits on the first big climb after mile 31. Double 50k lap on rocky Hill Country trail near mile 40 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 21 miles of fatigue management. Finish with reserve for the last descent.
Results
Dinosaur Valley finish lines.
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Sources (2)
- Field stats (2025): https://ultrasignup.com/results_event.aspx?did=122077
- Course record (F): https://ultrasignup.com/results_event.aspx?did=111284