Dinosaur Valley Endurance Run — 100 Mile

Event Overview

Listed edition overview
Date	Nov 21-22, 2026
Location	🇺🇸 Dinosaur Valley State Park, Glen Rose, Texas, USA
Format	Fixed-Distance
Terrain	Trail
Region	North America
Distance	100 mi
State / area	Texas (TX)
Course model	Loop
Edition note	The race publishes mandatory loop cutoffs rather than one standalone final cutoff.
Elevation gain	Approximately 9,000 ft
Cutoff	Mandatory loop cutoffs apply; qualifying runners receive up to 3 hours for the final 2.5-mile segment
Highlights	Dinosaur Valley State Park, Progressive Loop Cutoffs

Course & Terrain

Repeated trail loops inside Dinosaur Valley State Park, followed by the organizer's final short completion segment.

Key course features to know before comparing this race:

Dinosaur Valley State Park trail system
Repeated access to the race-base area between loops

Rolling and sometimes rocky Texas trail produces substantial cumulative climbing despite the repeated-loop layout.

Entry & Logistics

Listed qualification and support details
Registration and fees	Check the official event website for current availability, deadlines, prices, taxes, and refund terms.
Logistics note	Build the plan from every published loop deadline. The organizer's Western States qualifying standard is not the race's finish cutoff.

Why This Race Matters

Dinosaur Valley Endurance Run — 100 Mile is a useful reference point for runners comparing long fixed-distance ultras that still unfold over multiple days. Its format, terrain, and support model shape the kind of preparation required: not just fitness, but pacing discipline, nutrition planning, foot care, and the ability to make good decisions under fatigue.

Planning Notes

Prepare for sleep decisions, weather swings, and aid-station discipline. The distance is only one part of a multi-day fixed-distance race.
Treat intermediate cutoff gates as part of the course. Build enough margin for aid stops and late-race slowdown, and verify every current gate in the official rules.
Train for terrain-specific fatigue. Technical trails and mountain courses demand downhill durability, hiking efficiency, and reliable night lighting.
The directory does not mark this as having simpler logistics. Confirm qualification, terrain, support, registration, medical, and withdrawal requirements before planning around it.
Do not mistake the 35-hour Western States qualifier standard for a race cutoff
Each mandatory loop cutoff matters independently

Event FAQs

What is the Dinosaur Valley 100 cutoff?

The organizer publishes mandatory loop cutoffs, followed by up to three hours for the final 2.5-mile segment when a runner reaches it inside the required window.

Is Dinosaur Valley 100 a loop race?

Yes. The 100-mile event uses repeated park trail loops plus a final short completion segment.

Verification & Sources

Verification scope: the listed edition's date, location, format, and available logistics were checked against the event-specific official sources below during the directory review dated August 10, 2026. Organizers can revise details after review.

Official Dinosaur Valley race page — https://www.theactivejoe.com/dinosaurvalley
Official rules and policies — https://www.theactivejoe.com/dv-rules-and-policies
Official timing and results — https://www.theactivejoe.com/dv-timing-and-results
Multiday Running event directory review scope: August 10, 2026.