March 16 - 17, 2024

Grasslands Trail Run

LBJ National Grasslands

Alvord, TX 100 Mile, 50 Miler, Marathon, 1/2 Marathon, 15K

Registration Ended Sun. Mar 17, 2024 @ 7:30 AM

Race Description

The Grasslands Trail Run is held in the Lyndon B. Johnson National Grasslands, more than 20,000 acres managed by the U.S. Forest Service and situated north of Fort Worth. The trails loop among rolling hills and through a mixture of pine and oak grove forests, open fields, and livestock.

The race uses a series of trails that start and finish at TADRA Point Trailhead. The half marathon uses the blue trail; the marathon uses the white and blue trails; and 100-mile and 50-mile runners use the blue, white, yellow and red trails. The 15K (Sunday) will use the yellow trail. The course map shows all loops with aid stations marked.

Full race Information can be found on our website:

This race is held on equestrian trails. Elevation gain for the 100 miler is a gentle 4,000 feet and trails are non-technical. Participants in the 100 Mile will have a 30-hour cut-off. We believe this is the perfect 100 mile to complete in under 30 hours, or get a new PR.

Runners in the 50-mile, Marathon and Half Marathon will have generous cutoffs. Runners in the 15K will have a 3.5 hour cutoff, the same time the 100 mile distance finishes on Sunday.

Blaze Details

Our website is the best source for information. That includes:

Cupless Race Details:
Intro to Trail Running:


Runners will get a soft, comfy race shirt and specially designed buff for the race. Runners in the 100 mile will get a long sleeve shirt, if they register before we place our shirt order, 2 1/2 weeks prior to the event.

Volunteer Opportunities

Our races depend on amazing volunteers. When you volunteer, you earn race credits for future Blaze Trails races. Or, ask a family member to volunteer while you run and their race credits can transfer to you! Read more info on our policy and view our sign up pages for all races:

Refund Policy

We understand that things come up. If you can no longer run the race, if you cancel more than 30 days in advance, you will receive 100% race credit for another Blaze Trails Running event. If you cancel between 30 days 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. If you need an extended time to use your credit due to medical reasons (including pregnancy) or military deployments, please reach out beforehand.


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