Lajitas, TX, United States · Sunday, January 17, 2027

Fixed Distance 100K

Big Bend Ultra

109 days away
100 km Distance
not publishedn/a Climbing
5.0 est Grit · Challenging

Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.

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29.2622° N, 103.7758° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 9.5 hours 5:42 min/km average. Tight. You are racing the clock from the start. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Among the tightest 100K cut-offs we track. Measured against 214 races of the same distance. Cut-off calculator →
Field size ~136 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 edition (55km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, January

Daytime high 17°C
Night low 1°C
Rainfall Dry — rain unlikely
Daylight 10 h 29 m of light

Regional 2001-2020 average for January — NASA POWER, grid elevation 1090 m. Not a forecast.

Results history

Year Race Finishers Men's winner Women's winner
2026 55km 136 Michael Kolor · 04:41:03 Annette Hermelin · 05:39:50

33% of the 2026 field were women.

DUV results for the 2026 edition (55km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert
🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail.

  • Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
  • Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
  • Hydration Vests Flask capacity for 100 km, without the bounce.
  • Headlamps 100 km almost certainly means running into the night.
  • Accessories Chafe and blisters end more 100 km races than fitness does.

Salomon

Aero Glide 4 Grvl

$159.95 ★★★★★ 4.5

Asics

Trabuco Max 3

★★★★★ 4.6

Tailwind

Endurance Fuel

All-in-one calorie and electrolyte drink mix. 200 calories per serving.

$25 ★★★★★ 4.8

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5

Darn Tough

Micro Crew Ultra Running

Merino wool trail running socks with lifetime warranty. Blister-resistant.

$23 ★★★★★ 4.7
All gear guides →

Overview

The Big Bend Ultra, a 100k trail race, starts and finishes at the Barton Warnock Visitor Center at Big Bend Ranch State Park, a mile from Lajitas, TX. Its January 17th start means runners will experience the high desert in cooler temperatures. The single prior edition in 2026 saw 136 finishers.

With a 9.5-hour time limit, this 100k race has a tighter cut-off than 98% of its 215 peer events, demanding a consistent pace of 5.7 minutes per kilometer from start to finish. This limit offers little margin for error or extended breaks. The race's field size is larger than 81% of its 319 peer 100k races.

Similar races

Other 100K trail ultras, closest in distance first.