May 26, 2018

Murrell Park, Flower Mound, Texas
Race Start: 8:00 a.m.

This is an off-road triathlon and includes a 1200-meter swim, a 13.4 mile mountain bike and a 5.6 mile run. The race will take place on the most popular trail in the DFW Metroplex, Northshore trail on Lake Grapevine. The start will take place at Murrell Park (about midway on the one-way looped course). The swim will be in a cove at an out of service boat ramp. The mountain bikers will enter the course and travel in a counter clockwise direction, heading east first to do Loops 2, 3 & 4, and then to west on loops 1 and 5. This loop is fast, with a few technical sections to challenge you. The runners will head east on a counter clockwise loop of flowy single track.

Register for the XTERRA Rock Dallas Triathlon


Recognition of Your Awesomeness

Podium Categories

Male & Female – 3 deep
Physically Challenged
Male & Female – 3 Deep

Age Groups: – 3 Deep
Males: 15-19, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75+
Females: 15-19, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75+



$90 until 11:59 p.m. (CST) May 5
$100 until 11:59 p.m. (CST) May 25
$120 On-site Registration 6:30–7:30 a.m. race morning

2-person Relay

$120 until 11:59 p.m. (CST) May 5
$135 until 11:59 p.m. (CST) May 25
$155 On-site Registration 6:30–7:30 a.m. race morning

3-person Relay

$150 until 11:59 p.m. (CST) May 5
$165 until 11:59 p.m. (CST) May 25
$185 On-site Registration 6:30–7:30 a.m. race morning

*This will be a USAT Sanctioned event.  You must either possess a current USAT membership or purchase a 1-day membership ($15) during the on-line registration process.
Race is limited to 200 racers
All athletes must be at least 15 years of age by 31 Dec 2018.
*Photo ID (EVERYONE) and/or proof of USAT membership (Annual Members ONLY) required at packet pickup.
*Each athlete must pick up their own race packet. NO EXCEPTIONS!

Register for the XTERRA Rock Dallas Triathlon


Weekend Schedule

Thursday, May 24

Course open for riding, will be tentatively marked by 4:00 p.m.

Friday, May 25

Packet Pickup and Late Registration

Friday 3:00pm – 6:00pm

Bicycles Plus
1901 Long Prairie Rd #104
Flower Mound TX 75022

Course open for pre-ride and run ALL DAY. Start/Finish line area is not open for cars.

Saturday, May 26

Arriving at Murrell Park
Guard gate opens at 6 a.m. 

Check-in or On-site Registration:  
6:15-7:30 a.m.
Follow the signs after entering at guard gate

Transition Opens
6:10 a.m.

Swim Warm-up
7:30 a.m.

Transition Closes
7:40 a.m.

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

Race Start
8:00 a.m.

11:30 a.m.

Murrell Park, Flower Mound, Texas

Murrell Park is located on the north side of Lake Grapevine and is operated by the Army Corps of Engineers. This park sits on the bluffs of the north shore overlooking the main lake.

Day use is Free at Murrell Park. White Chalk Rd area start/finish/transition only open on race day.

Camping is available for $10/night. However, it is Memorial Day weekend, and reservations are required. Reserve early at Reserve America



-Swim wave starts will be based on participation. Decision will be made race week.
-Start at boat ramp and you will swim clockwise for a 1,200 meter loop with buoys on right shoulder (subject to change directions based on wind direction race day)
-A short run on pavement on boat ramp to transition.
-Swim caps will be REQUIRED. (We will provide them at Packet Pickup)
-If you need assistance, wave your arms or yell.  We will have multiple in-water kayaks that will render assistance.  You may hold onto kayak but not advance.

Note: Wetsuit Policy
Each age-group participant shall be permitted to wear a wetsuit without penalty in any event sanctioned by USA Triathlon up to and including a water temperature of 78 degrees Fahrenheit. When the water temperature is greater than 78 degrees, but less than 84 degrees Fahrenheit, age group participants may wear a wet suit at their own discretion, provided however that participants who wear a wet suit within this temperature range shall not be eligible for prizes or awards. Age group participants shall not wear wet suits in water temperatures equal to or greater than 84 degrees Fahrenheit. Current Water Temperatures can be found here:

XTERRA Rock Dallas Triathlon Swim Course

BIKE – 13.4 Miles (Mountain Bikes ONLY. NO Cyclocross bikes allowed. See Links below for rules)

-Bike will be a 1 lap of the most popular mountain bike singletrack in the DFW metroplex. Short, punchy hills, some rock garden sections, creek crossings, sand, and huge amounts of fast & flowy mixed in. This course is fun for ALL ability levels!
-Course will be ridden COUNTER-CLOCKWISE and will be marked with BLUE arrows and WHITE XTERRA tape.
-Aid Station(s) @Transition Bike Out and at 6.5 miles (Gatorade/Water). Please carry a hydration pack or water bottles for this leg of the race.

XTERRA Rock Dallas Tri Bike Course map and elevation

RUN – 5.6 Miles

-1 lap. All single track. Fast & Flowy.
-Course will be marked by RED arrows and WHITE XTERRA tape.
-Aid Station(s) @Transition Run Out & midway turnaround at mile 2.75 –  Gatorade/Water

XTERRA Rock Dallas Tri – Run Course map and elevation



IF you DNF from the RACE for any reason, PLEASE remove your timing chip before approaching the timer to let them know! We will have a bucket for timing chips to return your chip. Deposit your chip there and then let the timer know your bib number.



Only athletes with race numbers, race officials, and race management will be allowed into the transition area.  No others will be allowed in transition at any time. NO EXCEPTIONS!

Participants will be allowed to remove their bikes from transition starting after all participants have returned from the Bike portion of the event.  Please be courteous and aware while removing your items.  Anyone removing their bike prior to authorization or without permission from the Race Director will be disqualified.  If you have special circumstances, such as work commitments or something of this nature, come ask us and we will work with you.

XTERRA Sponsors



XTERRA Wetsuits

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. That said, we have never had to cancel the DIRTY DOZEN MOUNTAIN BIKE RACE yet. We even had snow one year. We did have to shorten the course to 8 hours instead of 12 though.