The Mammoth Glen Rose, TX - 100K - 50K - 25K - 10K - 5K and Mighty Mammoth 1K Fun Run
- Date Sat 10th October 2026 - Sun 11th October 2026
- Time 7:00AM CDT
- Location Glen Rose, Texas
- Price Free - $165.30
- Races 7 races
- Distances Ultra, 10km, 5km, 1km
Event summary
Join us for an unforgettable weekend at The Mammoth Race in Glen Rose, Texas, taking place from October 10th to 11th, 2026! This exhilarating multi-distance trail running event welcomes participants of all ages and skill levels to experience the breathtaking beauty of the Texas Hill Country at the stunning High Hope Ranch and Eco-Retreat. With race distances including 100K, 50K, 25K, 10K, 5K, and the Mighty Mammoth 1K Fun Run, there’s something for everyone, whether you’re a seasoned ultra-runner or a family looking for a fun day out.
The race kicks off on Saturday morning at 7 am, with participants traversing well-marked trails through pristine natural landscapes. Enjoy generous cut-off times, aid stations positioned approximately every 3.5 miles, and the excitement of a post-race celebration featuring music, food, and refreshments! Each participant will receive a Mammoth Race shirt and, for 100K finishers, an exclusive finisher buckle. Plus, camping options are available for those looking to extend their adventure. Don’t miss this chance to be part of a vibrant community celebration of fitness and nature—mark your calendars for The Mamm
The race kicks off on Saturday morning at 7 am, with participants traversing well-marked trails through pristine natural landscapes. Enjoy generous cut-off times, aid stations positioned approximately every 3.5 miles, and the excitement of a post-race celebration featuring music, food, and refreshments! Each participant will receive a Mammoth Race shirt and, for 100K finishers, an exclusive finisher buckle. Plus, camping options are available for those looking to extend their adventure. Don’t miss this chance to be part of a vibrant community celebration of fitness and nature—mark your calendars for The Mamm
Organiser's Description
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 [https://www.highhope.eco/]. 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
* NO PLACE FINISHER AWARDS. BRAGGING RIGHTS ONLY
PACKET PICK-UP
* RACE DAY on site
PARKING
* Price INCLUDES Entrance and Parking
OVERNIGHT CAMPING
* $10 per PERSON. NOT included in registration. Max 6 people per site. PAYABLE AT THE GATE
REFUNDS/TRANSFERS
* Race Entry Fees are NON-REFUNDABLE, however TRANSFERS to another Person, Category or Mammoth Event are allowed.
COURSE MAPS - Viewable HERE [https://www.mammothrace.com/glenrose-tx]
The Mammoth - Glen Rose, TX is a multi-distance trail running event located on the trails High Hope Ranch and Eco-Retreat [https://www.highhope.eco/]. 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
* NO PLACE FINISHER AWARDS. BRAGGING RIGHTS ONLY
PACKET PICK-UP
* RACE DAY on site
PARKING
* Price INCLUDES Entrance and Parking
OVERNIGHT CAMPING
* $10 per PERSON. NOT included in registration. Max 6 people per site. PAYABLE AT THE GATE
REFUNDS/TRANSFERS
* Race Entry Fees are NON-REFUNDABLE, however TRANSFERS to another Person, Category or Mammoth Event are allowed.
COURSE MAPS - Viewable HERE [https://www.mammothrace.com/glenrose-tx]
Races
-
100K Ultra Trail Run
Incl. $10.30 Fee & T-Shirt
Sat 10th October 2026 (7:00AM CDT)
$165.30
-
50K Trail Tun
Incl. $7.90 Fee & T-Shirt
Sat 10th October 2026 (7:15AM CDT)
$122.90
-
25K Trail Run
Incl. $6.10 Fee & T-Shirt
Sat 10th October 2026 (7:30AM CDT)
$91.10
-
10K Trail Run
Incl. $4.90 Fee & T-Shirt
Sat 10th October 2026 (8:30AM CDT)
$69.90
-
5K Trail Run
Incl. $4.30 Fee & T-Shirt
Sat 10th October 2026 (9:00AM CDT)
$59.30
-
The Mighty Mammoth 1K Fun Run
Incl. $2.80 Fee & T-Shirt
Sat 10th October 2026 (11:00AM CDT)
$32.80
$25.00 REGISTRATION - YOUTH SHIRT SIZES ARE SOLD OUT. WE CANNOT GUARANTEE A SHIRT. -
PACER - 100K Ultra Trail Run
Sat 10th October 2026 (7:00AM CDT)
Free
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High Hope Ranch and Retreat Center, Glen Rose, 76043, TX, United States
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The Mammoth Glen Rose, TX - 100K - 50K - 25K - 10K - 5K and Mighty Mammoth 1K Fun Run
