Ultramarathons in Texas
As of October 6, 2026, Crewable lists 71 upcoming ultramarathons in Texas from October 2026 to July 2027. The next is Autumn Harvest 50K • 20-Miler • 10-Miler • 5-Miler • Full • Half • 10K • 5K • Big Bastrop Backyard Ultra (Last Runner & Last Rucker Standing) on October 10 in Bastrop. Registration is open for 35.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
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October 2026
23 racesAutumn Harvest 50K • 20-Miler • 10-Miler • 5-Miler • Full • Half • 10K • 5K • Big Bastrop Backyard Ultra (Last Runner & Last Rucker Standing)
Bastrop, TXBackyard Ultra50K+7Open until Oct 9from $65.99The Mammoth Trail Run 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Kids Dash
Glen Rose, TX100K50K+3Open until Oct 11from $35Fields of Gold 50K • Marathon • Half Marathon • 12 Hour • 1 Hour • 10K • 5K
Marble Falls, TX50 mi12 hr+5Open until Oct 22from $49.99
November 2026
12 racesMustang Marathon (Hill Country Trivium) Road Race
Marble Falls, TX50KMarathon+3Open until Nov 9from $10Colorado River Run: 100-Mile & 50-Mile Ultra, 50K, Marathon, Half-Marathon, 10K and 5K
Marble Falls, TX250K100 mi+6Open until Nov 27from $15
December 2026
8 racesJanuary 2027
7 racesFebruary 2027
5 racesMarch 2027
4 racesApril 2027
3 racesMay 2027
3 racesJune 2027
4 racesJuly 2027
2 racesQuick answers
What is the next ultramarathon in Texas?
Autumn Harvest 50K • 20-Miler • 10-Miler • 5-Miler • Full • Half • 10K • 5K • Big Bastrop Backyard Ultra (Last Runner & Last Rucker Standing), on Saturday, October 10, 2026, in Bastrop. Distances: Backyard Ultra, 50K, Marathon.
How many ultramarathons in Texas have open registration?
35 of the 71 list registration as open as of October 6, 2026, including Autumn Harvest 50K • 20-Miler • 10-Miler • 5-Miler • Full • Half • 10K • 5K • Big Bastrop Backyard Ultra (Last Runner & Last Rucker Standing), Caveman Challenge at Waterloo Lake and FireAnt 5K & Tour de FireAnt Bike Ride.
What is the busiest month for ultramarathons in Texas?
October 2026, with 23 of the 71. November 2026 follows with 12.
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