Grasslands Trail Run

Saturday, March 15 – Sunday, March 16, 2025

100 Mile – 50 Mile – Marathon – Half Marathon – 15K

The Grasslands Trail Run has been a North Texas Trail Running tradition since 1999. The race is held annually on the third weekend in March at the LBJ National Grasslands near Decatur, TX on more than 20,000 acres managed by the U.S. Forest Service. The trails loop among rolling hills and through a mixture of pine and oak grove forests, and open grassland fields. Unique to North Texas trail races, there is approximately 45 miles of non-overlapping trail. The Marathon, Half Marathon and 15K are all held on 100% unique trail. With a gentle elevation profile (approximately 4000 ft of elevation gain in the 100 miler) the race course is very runnable which makes it an excellent choice as a first trail race in any of the distances offered. Run a race on one or both days and enjoy the beauty of one of our National Grasslands while sharing the trails with horses and running past cows—don’t let the cows out!

Race Week Schedule


4:00 – 6:00 p.m.
Packet Pick up
Trailhead Running Supply Co., Flower Mound, TX


Packet Pickup
TADRA Point Trailhead
FS 904
Alvord, TX 76225
3:00 – 6:30 p.m.

100 Mile, Pre-race Briefing
5:30 p.m.
Attendance is optional, but encouraged

*You may pick up bibs/shirts for friends and family.

Saturday (Race Day)

4:30 – 8:30 a.m. Race Day Packet Pickup and Timing Chip Pick Up
5:00 a.m. 100 Mile Start
6:00 a.m. 50 Mile Start
7:30 a.m. Marathon Start
8:30 a.m. Half Marathon Start

All races are gun timed. Please arrive on time.


6 – 7:30 a.m. Packet Pick Up and Timing Chip pick up
7:30 a.m. 15K start time

11 a.m. Cutoff for 100 Mile and 15K

See cutoff times for distances below.

All races are gun timed. Please be sure to arrive on time.


The race start is TADRA Point at the LBJ National Grasslands (Linked to Google Map for reference only). In most cases Google Maps are good enough to get to the site. Cell coverage is pretty good to Decatur. However, as you get closer to the race site cell coverage can be spotty in some places along the way. Please don’t depend solely on your GPS!

Please arrive early enough to park, pick up your bib and/or timing chip, and pay the day use fee ($10 cash). You will pay the day use fee at packet pick up to make the morning easier. We recommend that you arrive at least one hour ahead of time, more if you are running the half marathon which is the most popular distance.

IMPORTANT: As you get closer to the race site, we will have large signs that say “TRAIL RUN” with directional arrows pointing the way. We have set up these signs to make sure traffic to the race site is orderly, and so we can quickly direct everyone into the parking area.

Directions from HWY 380 in Decatur:

  • Take FM 730 North – Drive approximately 9 miles to CR 2461.
  • Turn LEFT onto CR 2461.
  • At the first fork, turn RIGHT onto CR2560 (There will be a couple of brown signs pointing)
  • Continue approximately 2.4 miles to FS900 (There will be two signs both with arrows pointing left one for TADRA Point and the other for Cottonwood Lake)
  • Turn LEFT  on FS900 and Continue 1.8 miles to TADRA Point on the right side of the road.



Prizes will be awarded as follows to the top finishers in all events:

  • The top three overall male and female finishers
  • The top male and female Master’s finisher (40+)*.

Awards will be presented at the finish line after the results have been verified. We do not mail awards after the event.

* Any master runner who places in one of the top overall positions will be ranked in the open division. Masters awards will then be awarded based on the next eligible runner within that division.

Finisher Medals

All finishers will earn a finisher’s medal unique to their race distance.

  • 100 mile finishers will earn a buckle.
  • Finishers in the 50 Mile, Marathon, Half Marathon and 15K will earn a medal unique for the distance.


Runners in the 100 Mile will receive a long-sleeve, soft, comfy shirt, if they are registered before we place our shirt order, approximately 2 1/2 weeks before race day.

Runners in all other distances will receive a short sleeve, soft, comfy race shirt.

All runners will also get a specially designed buff for the race.

Please note the following:

  • We do not mail shirts/swag to participants who do not attend the race.
  • Transfers to another runner after the shirt deadline will receive the shirt size indicated by the original registrant.
  • We only exchange shirts for a different size after the race if we have extra sizes available.

Course Maps

The Grasslands Trail Run is held on the multi-use trail system at the LBJ National Grasslands. The race uses the Blue, White, Yellow, and Red trails. The colors in the tables to the right match the colors of the trails in the course map to the left.

For more details on how the course is marked see the following link: COURSE MARKING

15K Course Map

Grasslands Trail Run - 15K - Course Map

Half-Marathon Course Map

Grasslands Trail Run - Half-Marathon - Course Map

Marathon Course Map

Grasslands Trail Run - Marathon - Course Map

50 Mile Course Map

Grasslands Trail Run - 50 Mile - Course Map

100 Mile Course Map

Grasslands Trail Run - 100 Mile - Course Map

Aid Stations

This is a cupless race. Please bring your own hydration device such as a water bottle or hydration pack to carry, consume and refill fluids on the course. Aid stations will include water (provided by Crazy Water), Gatorade, soda, pickle juice and many food items such as bananas, oranges, potato chips, Oreos, fig cookies, applesauce, peanut butter and jelly sandwiches, peanut butter cookies, fruit snacks, M&Ms, and other things that we find and think might be appreciated by our runners or fun.

At night, we will have hot food at three aid stations: the start/finish, Outback (blue and yellow trail), and Windmill 2 (white and red trail). Hot foods will include ramen, quesadillas with cheese and vegan options such as avocado or bean dip, bacon, and some other foods too.

Aid stations will also have SaltStick, ginger candies (for nausea), a first aid kit and feminine products (tampons).

Drop Bags

Please make sure your drop bags are water resistant as we cannot guarantee that they will not get wet in case of inclement weather. Many options are available, anything from dry bag to a zip-lock bag. All drop bags should be labeled last name, first name. Optionally add your bib number if you come to early packet pickup. Remember to pick up your drop bag at the end of the race. All drop bags left will be discarded after the race.

Time Cut Off

100 Mile

A full pace chart is available here, including a pace for 20 hour, 24 hour and 30 hour. NOTE – we will update cutoff times for the 2025 race based on data from the 2024 race.

  • Participants must finish the race by Sunday at 11 a.m.
  • Runners must start their second Blue Loop (mile 54.9) no later than 10 p.m.* (Time for 30 hour pace, 9:21 p.m.)
  • Runners must start their final Red Loop (mile 82.5) no later than 6 a.m.* (Time for 30 hour pace, 5:36 a.m.)
  • All must start their final Yellow Loop (mile 91.4) at 8:15 a.m. on Sunday.

*Cutoff times have been set to ensure your safety while giving you every opportunity to succeed and complete the distance. Making the early cutoffs does not guarantee you will finish the race. However, if you hit a low point during your run and have recovered, we hope this allows you to make up the time and finish.

50 Mile

  • Participants must finish by 6 a.m. on Sunday.


  • Runners must finish by 11:59 p.m. on Saturday.


  • Runners must finish the race by 11:00 a.m., or 3.5 hours.


Pacers will be allowed in the 100-mile race, beginning at mile 54.9. This is the start of the blue loop. Pacers can be picked up, dropped or swapped at the start/finish aid station between loops.

If someone wants a pacer before mile 54.9, it is by exception only and must be requested one week before race day. One example would be for runners 65+ years old or someone who requires a pacer before sunset due to problems with their eyesight.

In the 50-mile race, pacers are only allowed in the final out and back, and only if running in the dark.


Camping is available at the TADRA Campground by the start/finish line. Sites are available on a first-come, first-serve basis. TADRA is a fee area ($10/day) with a self-pay station available for all campers. Pit toilets are available at the campground, and there is no potable water or electricity.


Holiday Inn Express Hotel Suites
1051 North Hwy 81/287
Decatur, TX 76234
(888) 465-4329

La Quinta Inn & Suites
1600 South Highway 287
Decatur, TX 76234
(940) 627-0250

Fairfield Inn & Suites Decatur
1910 West US Highway 380
Decatur, TX 76234
(940) 627-6045

Baymont Inn & Suites
600 W Hale Avenue
Decatur, TX 76234
(940) 627-3338

Best Western Decatur Inn
1801 South Hwy 287
Decatur, TX 76234
(940) 627-5982

Econo Lodge
1709 TX 287
Decatur, TX 76234
(940) 627-6919

Rodeway Inn-Decatur
1507 Hwy 287 South
Decatur, TX 76234-2443
(940) 627-6262

Course Records

50 Mile

Men’s Josh Heimback 6:19:40 2023
Women’s Shandra Moore 7:53:13 2017


Men’s Todd Reynolds 3:01:33 2006
Women’s Melanie Rabb 3:32:47 2017

Half Marathon

Men’s Josh Heimbach 1:19:27 2022
Women’s Sarah Reardon 1:30:29 2004

Race Rules

Chip Timing – Even though this is a chip-timed race your start time is based off of Gun Time.  All splits and finish time is based on when you cross the timing mat. You will not get an official time unless you are wearing your chip for the entire race. The chips are sensitive to angle and proximity with the timing mat so wear the chip around your ankle, as intended. 

No Littering – We host the race by special permit from the Forest Service. Please respect the trail. Intentional littering will not be tolerated and is grounds for disqualification. Each aid station will have garbage bags. If you have garbage between stations, carry until the next aid station. This includes wrappers from gels, food items, etc. 

Running the Course Correctly – Any runner who does not run the course in the proper direction/order may be disqualified from the race. Make sure you study the course maps and understand the order and direction of the trails you will run in your race. It is your responsibility to understand the course.

Cutting the Course – Anyone who cuts the course intentionally will be disqualified and may be banned from registering from future Blaze Trails  races. Anyone who cuts the course unintentionally may be disqualified or assessed a time penalty at the sole discretion of the race director. 

Crews are not allowed at any location other than the Start/Finish at TADRA Point. There is not enough parking at any remote aid station for crew vehicles.

Outside Aid is not permitted. Aid is only allowed at designated aid stations. 

Dropping from the Race  While we don’t prohibit dropping at remote aid stations, we typically do not shuttle people back to to the start/finish except in the most dire circumstances. If you need to drop, please check out from the race and provide your race chip to the timer at the Start/Finish.

Don’t Let The Cows Out – Please close and chain the cattle gates along the course behind you. The forest service leases sections of the grasslands for cattle grazing from time to time. Anyone violating this policy will be disqualified.

Share the Trail—with people and animals!

Grasslands is a combination of single-track and equestrian trails. If someone is behind you and ready to pass, please step to the side and allow them to pass.

You might come across horseback riders. When approaching, talk to the riders and let them know that you are coming up. Hearing your voice will prevent a horse from getting spooked. Give riders time to move to the side.

Cows are also sometimes in fields or even on the trail in front of you. Please run around them, giving them plenty of space.

Respect Volunteers and Race Staff – Our Volunteers are pretty darn great! Please be courteous and thank them for coming out to support the race. 

Headphones – We do not prohibit Headphone use during the race. However if you do decide to use headphones, we’d like to ask that you listen with one ear only so you can be aware of other runners and your surroundings.

Registration and Refund Policy

We understand that things come up. If you can no longer run the race, if you let us know more than one month in advance, you will receive 100% race credit for another Blaze Trails Running event. If you let us know between one month and two weeks prior to race day, you will receive 50% race credit towards another Blaze Trails Running event. We will not allow any refunds or transfers less than two weeks before race day. No exceptions.

To cancel, log into Ultrasignup > Registration History and select “Edit” to cancel your race. Your credit needs to be used within one year. Please reach out beforehand if you need an extended time to use your credit due to medical reasons (including pregnancy) or military deployments.

We allow changes in race distance as long as we still have openings in that distance. If you move to a longer distance, you must pay the difference. If you move to a shorter distance, you will not get that difference back.

Bib transfers to another runner are allowed until two weeks before the race, only if the race has not sold out. If you want to transfer your bib to another person, please contact us immediately. It is very important for the safety of all runners that we have the correct contact and medical information. If the shirt order has already been placed, the person you transfer to agrees to accept the size you ordered. The person accepting the bib transfer will be charged a $15 administration fee (plus transaction fee). We do not allow transfers if the event has sold out and has a waitlist. In that case, we will follow the posted refund policy and allow the next person on the waitlist to register. If you contact us in the last two weeks to ask for a transfer, we will not reply, and the transfer is not allowed. No exceptions.

I understand that I am not entitled to a refund if the race director and/or race officials are forced to cancel the race due to any participant safety issue on the course that is out of the race organizer’s control. This may include, but is not limited to flooding, lightning, or any other weather condition that makes the course unsafe for participants.