The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run
- Date
- October 10–11, 2026
- Distance
- 100K Ultra Trail Run · 50K Trail Tun · 25K Trail Run & more
From the Organizer
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
- 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
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
81°
Typical Low
54°
Chance of Rain
19%
Based on US Climate Normals data from Rainbow, 4 mi from the venue.
Host City
About Glen Rose, TX
Population
2,770
as of 2023
Elevation
654 ft
Nearest Airport
MWL
Mineral Wells Regional Airport · 42 mi
Major Hub
DFW
Dallas Fort Worth International Airport · 62 mi
Time Zone
Central Time
From Endurance Grid
A small town race. Lodging near the start could be limited, so book early.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run, put it on the calendar, and turn “someday” into a start date.
124
Days to train
- Race
- The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run
- Date
- October 10–11, 2026
Coming Up
More Running races near Glen Rose, TX
Grassroots Running Series #2
24 miles away
Lake Granbury Kiwanis Firecracker 5K & 1M Fun Run
5K
14 miles away
Old Settler's 5K Run/Walk
5K
24 miles away
Blazin' Saddle 75 Bicycle Rally
14 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The 10K is the distance where running stops feeling like a starting point and starts feeling like a sport. Long enough to require a real training block. Short enough that race day is fully manageable for a first-timer who's put in the work.
Race day energy at a 10K is community at its best — strangers cheering you by name, people moving toward the same goal, an atmosphere that solo training can't replicate. It's fast enough that you'll spend the whole race pushing rather than managing your effort.
This is also the distance that builds the base for everything else. Most athletes who go on to run half marathons, do triathlons, or compete in HYROX started here. What you need: running shoes fitted to your stride, a training plan, and the race on your calendar. The registration is what makes the deadline real.
How long to train: 4–8 weeks for most fitness levels.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run?
- The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run is a running race held in Glen Rose, Texas on October 10, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run?
- Saturday, October 10, 2026 in Glen Rose, Texas at High Hope Ranch and Retreat Center, Glen Rose, TX. Check the event page for exact start times and wave schedules.
- How do I register for The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run
Oct 10, 2026