100K Races in Texas
As of October 6, 2026, Crewable lists 21 upcoming 100K races in Texas from October 2026 to July 2027. The next is The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Kids Dash on October 10 in Glen Rose. Registration is open for 8.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
3 aid
3 aid
2 aidRace calendar
October 2026
5 racesThe Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Kids Dash
Glen Rose, TX100K50K+3Open until Oct 11from $35
November 2026
2 racesDecember 2026
3 racesJanuary 2027
5 racesFebruary 2027
2 racesMay 2027
2 racesJune 2027
1 raceJuly 2027
1 raceQuick answers
What is the next 100K race in Texas?
The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Kids Dash, on Saturday, October 10, 2026, in Glen Rose. Distances: 100K, 50K, 25K.
How many 100K races in Texas have open registration?
8 of the 21 list registration as open as of October 6, 2026, including The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Kids Dash, Love Never Ends Trail Run and Panola Push Pedal Run.
What is the busiest month for 100K races in Texas?
October 2026, with 5 of the 21. January 2027 follows with 5.
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