July 7, 2018

Dinosaur Valley State Park, Glen Rose, Texas
Race Start: 8:00 a.m.

Come run and bike where the dinosaurs roamed! This is a 5k trail run / 15k mountain bike Ride / 2k trail run. Course will be marked so teams do not need navigation skills. You may race solo or on a relay team with one runner and one biker. The runner will need to complete both run legs. The trails can be rocky and technical in spots, so bring your sense of adventure.

Register for the Jurassic Off-road Duathlon



Each person on a team will register separately but use the same exact team name as your teammate.

  • 2 Person Male Relay
  • 2 Person Female Relay
  • 2 Person Coed Relay
  • 2 Person Parent/Child (child under 18)
  • Solo Male
  • Solo Female


Recognition of Your Awesomeness

Pricing (per person)

Early-bird Registration
$72 until June 16, 11:59 p.m. (CST)

Regular Online Registration
$82 until July 6, 11:59 p.m. (CST)

On-site Registration
$92  6:30–7:30 a.m. race morning

Athletes 18 and younger are $20 off the above pricing.

Kids’ Races
for children 10 and under – Free
This race starts at the conclusion of the regular duathlon race and typically lasts 2-3 minutes. Parents of small children can carry their child or run alongside. Most of the race is on foot and the children will usually get to do some form of a fun mystery event as we run them through the start/finish and transition area. All kids receive a medal and stickers at the finish line.

Register for the Jurassic Off-road Duathlon


Weekend Schedule

Saturday, July 7

Arriving at Dinosaur Valley State Park
Your race registration includes the park entrance fee, but you still need to stop at the park entrance to let the rangers know you are here to race. They will give you a sticker for your window.

Primary parking is located near Track Site 2 as well as to the north of the Amphitheater. We will have signs up to help direct you to the parking for the race that is closest to the amphitheater. There is no parking at amphitheater, as we use that area for emergency vehicles, and the race flows in and out of that lot.

Check-in or On-site Registration 
6:30-7:30 a.m.
Registration table will be at Amphitheater.

Mandatory Pre-Race Meeting
7:45 a.m.

Race Start
8:00 a.m.


Dinosaur Valley State Park, Glen Rose, Texas

Dinosaur Valley State Park is by far one of the most family friendly venues in Texas.

Camping is extra and you can register for a site through our registration page. We have reserved a limited amount of campsites for Friday and Saturday night, with water/electric that are $25 per site, per night. These sites are first come/first serve as you arrive on the day of your reservation. Camping is non-refundable and always sells out.

Dinosaur Valley State Park is a public trail and will NOT be closed just for this event so please be courteous of your fellow outdoor enthusiasts.


This is an off-road duathlon, which by nature, is an adventure. Be flexible on race day. The courses we choose are subject to change and depend on the water flow and rain in July.

Duathlons are self-sufficient. You must carry water bottles or a hydration pack at least for the bike portion. It is mid-summer and this is a fairly rocky course with plenty of climbing. You will need hydration!

5k Trail Run
The 5k loop runs from the amphitheater down to cross the river at a slippery, low water crossing (yes you will get your feet wet early on), then makes a rocky ascent to a scenic overlook before heading back down, then along the river to a 2nd river crossing where you will head back on a trail behind the campgrounds. Some years we cross the river by hopping from rock to rock at Dino Track #2. Any way you cut it, the climb to the scenic overlook and back down are steep and rocky. You will cross the river twice (once at the start and once at the end of the loop).

15k Bike
The 15k loop rides from the amphitheater down to cross the river at a slippery, low water crossing, then heads out on a rocky trail that will take you around much of Dinosaur Valley State Park’s outer loop trail. This is a challenging course but plenty of fun.

2k Trail Run
The final 2k run will an easier loop than the first. You’ve earned it by now!

Mountain Bikes & Biking Helmets for each rider (CPSC Certified Bike Helmet), running shoes, sense of adventure, and method of carrying water on run or bike (water bottle or hydration pack).


Extra Bits

*Right to Cancel or Reschedule – Terra Firma Racing LLC reserves the right in the event of inclement weather, emergency, or natural disaster to cancel the race or move to a later time that day or alternate date within the year—if available. In the event of a CANCELLATION with no ability to reschedule, there will be NO REFUND OF ENTRY FEES. Each athlete must accept any such risk for their entry paid.