Dinosaur Valley Endurance Run

at Dinosaur Valley State Park

100 Mile / 100K / 50K / 25K / 5 Mile

NOVEMBER 23, 2019


The race is held at the beautiful Dinosaur Valley State Park in Glen Rose, Texas. This course has rolling and sustained ascents and descents, although none are terribly steep. The loops take you through varied terrain, from double track trails in fields to single track in wooded areas. There is a mix of packed dirt, smaller rocks, larger rocks, slick rock, and some roots. There are also two river crossings per race loop. This course really has a little of everything, which includes its views. There are amazing overlooks on this course where you can see for miles.

(Details on how the venue change in 2016 came about are here... The first two years the race took place at the highest point in the city of Dallas, Prayer Mountain, which is home to the Mountain Creek Church. The church owns the Big Cedar Wilderness Trail, which is maintained by the Dallas Off-Road Bike Association.)

The course we are using was first used in 2018.


Course Layout

5 Mile – 5-mile reduced portion of the main loop.

25K – 5 mile course for your first loop THEN 1 loop of the 10.5-mi loop.

50K – 3 loops of the 10.5-mi loop.

100K – 6 loops of the 10.5-mi loop.

100 Mile – 5 mile course for your first loop THEN 9 loops of the 10.5-mi loop.



10.5-mile loop (used for 25K, 50K, 100K, 100 Mile)

Click on the map to see it bigger as a PDF!


5-Mile Loop Map (used for 5 mile, 25K, and 100 miler)

Click on the map to see it bigger!


5 Mile Course Map

The 5 mile route does not cross the river at any time. They still get to enjoy the well known scenic overlook where you can see down to the river about 4.25 miles in! And then we cut the half marathon course short to route runners back to the finish line.

Click on the map to see it bigger!


For All Courses:

Details on the aid stations this year...

Mileage is not for contestation. You will cover at least the distance you signed up for.



Course may be subject to significant change due to weather conditions.



This is not an exhaustive list but some hazards to watch out for on the trail:

  • Snakes - we've had a cold snap recently, so we hope they will have headed to hibernate. There are copperheads spotted in the spring, summer, and fall.
  • Bobcats and coyotes - we don't expect them to give anyone any trouble, but they do live in these woods.
  • Cactus - Be careful going off trail to use the bathroom.
  • River crossings - there are two per race loop, as well as 750 feet along and through a creek that empties into the river. We think it makes this course even more unique and cool. You will get your feet wet in both crossings. In rainy conditions, it may be calf deep. You need to pick your footing carefully on the rock shelves and rocky river floor. Take caution, especially in the middle of the night.
  • Slickrock - it's fine unless it rains and then it lives up to its name. Watch your footing.
  • Loose rocky terrain



As a state park, they have established a grid of trails through their land. It is each participant's responsibility to watch carefully for course markings. We will be using a combination of

  • bright pink contractor tape flagging, with reflective tape on the ends to capture the light of your headlamp in the dark, that will be clothespinned to tree branches and bushes.
  • bright pink stake flags for major field sections that don't have bushes to attach ribbons to
  • arrow signs (left, right, straight)

In spots where there's an intersection, just follow the flagging for the correct route to take if there are no arrow signs specifically. Flagging will be visible from where you are standing in the intersection.

Confidence flagging: For trail sections where there's no possible logical offshoot of a trail that you could take other than the one you are on, you may go as far as a half mile without flagging.

If you ever get to a spot where you are completely unsure of where you are, backtrack on the path you took until you get to course markers. If you become utterly and completely lost, never ever go off trail. Sit down where you are and wait until someone gets to you.

Ultimately, you are responsible for knowing the course.



See here on the Race Details page...



See here on the Race Details page...



All items on this page subject to potential significant change.


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