Leakey, TX, United States · Saturday, October 17, 2026

Fixed Distance 50K

South Texas 50km Ultra

31 days away

50 km Distance

700 m Climbing

3.6 Grit · Challenging

29.7288° N, 99.7614° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 14 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 14 hours 16:48 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 86% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →

Field size ~41 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, October

Daytime high 28°C

Night low 15°C

Rainfall Mostly dry

Daylight 11 h 26 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 444 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a fast & flat course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for 50 km of trail with 700 m of ascent.

Trail Running Shoes50 km of trail — cushioning that is still there in the last quarter.
Race Nutrition50 km of self-supported fuelling between aid stations.
Hydration VestsFlask capacity for 50 km, without the bounce.
HeadlampsA 14 h limit puts you out there after dark.
GPS WatchesBattery life first — a 50 km day outlasts most full-GPS modes.

Adidas

Terrex Speed Ultra

★★★★★ 4.5

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Skratch Labs

Sport Hydration Mix

Clean electrolyte drink mix with real fruit flavor. Low sugar.

$20 ★★★★★ 4.5

Salomon

ADV Skin 12

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

$180 ★★★★★ 4.8

Petzl

NAO RL

1500-lumen reactive lighting headlamp with 15-hour runtime. Automatic brightness adjustment.

$150 ★★★★★ 4.7

COROS

APEX 2 Pro

GPS running watch with 75-hour GPS battery, topo maps, and training metrics.

$500 ★★★★★ 4.7

All gear guides →

Course Notes

The South Texas Ultra is a 50K, 35K, 17K, and 5K scenic trail run held on the H.W. Lewis Ranch in the Texas Hill Country. Featuring beautiful scenery and challenging rocky, dirt, and grass trails with over 2300 feet of elevation gain for the 50K even

Similar races

Other 50K trail ultras, closest in distance first.