From big races to Saturday morning group runs—find fun run events and connect with the local endurance sports community.
Experience our fun race being hosted at Dinosaur Valley State Park. Have fun in the morning sun on some "behind the scenes" trails that are open to the public just for this special event. The 2nd Annual Dino Stomp Out Kids Cancer is a family fun run/walk fundraiser benefit for children fighting cancer hosted by Brooke’s Blossoming Hope for Childhood Cancer Foundation. Try the 1-mile fun run/walk/hike or venture farther in HOPE on the 5K course stomping alongside real DINO TRACKS on the shores of the Paluxy River. Come enjoy a day of family fun! All ages and fitness levels welcome.
Race t-shirts guaranteed to racers registered by April 30, 2026.
Early Bird Registration Fees (thru April 30) :
5K - $25.00
1M- $10.00 (Kids who race can get a FREE KITE for the Post-Race Flying Event)
Advanced Registration Fees (May 1-June 5) :
5K- $30.00
1M- $12.00 (Kids who race can get a FREE KITE for the Post-Race Flying Event)
Race Day Registration Fees (June 6) :
5K - $35.00
1M- $15.00 (Kids who race can get a FREE KITE for the Post-Race Flying Event)
Award Categories:
Age Divisions: Male & Female
9 and under, 10-12, 13-14, 15-17, 18-20, 21-25, 26-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70 and over
Medals for Top Finishers and Kites for Kids
Race Day Schedule:
Walk-Up Registration: 6:30-7:30am
5K Race START @ 8:00 am
1 Mile Fun Run START @ 5 minutes after the last 5K runner starts
Get ready for The Mammoth Race Glen Rose FALL migration. This multi-distance trail run welcomes families and runners of all skill levels. Enjoy the Hill Country that surrounds this stunning ONE THOUSAND acre ranch. We can't wait to see you out there!
The Mammoth - Glen Rose, TX is a multi-distance trail running event located on the trails High Hope Ranch and Eco-Retreat. Distances offered are 100K, 50K, 25K, 10K, 5K and The Mighty Mammoth 1K FUN RUN. There will be two sections of the course: a 3.5-mile loop and a 7-mile loop. Both loops combined equal a 10.5 mile lap. The event will run from 7 am on Saturday morning until 9 am on Sunday morning. The starting line and Main Race Hub will be the main lodge on the Ranch. There are two aid stations on course: the main lodge at the starting line, and Matazamo ranch house. Aid stations are approximately 3.5 miles apart.
RACE CATEGORIES:
100K - 26hr Cut-off time
50K
25K
10K
5K
Mighty Mammoth 1K Fun Run - NON-CHIP TIMED EVENT.
RACE HIGHLIGHTS:
Finisher Shirts and Medals
Generous Cut Off times - Cut off time for 100K only!
Finisher BUCKLES for 100K Ultra
Scenic routes through pristine natural landscapes
Well-marked trails and 'round the clock aid stations
Exclusive sites for tent camping and boondocking (no hook-ups)
Post-race celebration. Music, food and refreshments!
ADDITIONAL INFO:
PETS ARE NOT ALLOWED. USATF sanctioned event policy does not allow for animals to participate in competitions.
The Mammoth is an Enviro-Friendly Event - B.Y.O.B (Bring Your Own Bottle)
RAIN or SHINE. In the event of inclement weather that would threaten the safety of the racers, the event or courses may be altered or the event may be delayed or canceled.
RACE DAY SCHEDULE
100K - 07:00am
50K - 07:15am
25K - 07:30am
10K - 07:45am
5K - 08:00am
1K - 10:00am
CLASSIC SWAG
All participants will receive a Mammoth Race OFFICIAL Race shirt and a Finisher's Medal.
Finisher BUCKLES for 100K ULTRAS
AWARDS
PACKET PICK-UP
PARKING
OVERNIGHT CAMPING
REFUNDS/TRANSFERS
COURSE MAPS - Viewable HERE