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In 37 days · Saturday, December 12, 2026

OUTLAST SAN ANTONIO (18 Miles)

San Antonio, Texas, United States

Typical weather · mid-December

Weather data for mid-December is not yet available for this race.

About This Race

OUTLAST SAN ANTONIO (18 Miles) covers a distance of 18.0 mi. This non-standard distance offers a unique challenge that sets it apart from traditional race formats.

This is a trail race, taking you off-road onto natural terrain including dirt paths, rocks, and varied surfaces. Trail running engages different muscles than road running and requires more focus on foot placement. Trail-specific running shoes with aggressive grip are highly recommended for OUTLAST SAN ANTONIO (18 Miles).

The race takes place in San Antonio, Texas, United States, offering participants a chance to experience the local running community and explore the area before or after the event.

Questions

What's different about running on trails?

Trail running requires more attention to foot placement and engages stabilizing muscles differently than road running. You'll typically run slower on trails due to terrain variations. Trail shoes with aggressive lugs provide better grip, and a more upright posture helps you see obstacles ahead.

Race Distances

This race

29 km

18 mi

This race has a non-standard distance, offering a unique challenge.

Compared to other distances Typical time

  • 5K

    5 km · 3.1 mi

    20–40 min

  • 10K

    10 km · 6.2 mi

    40–70 min

  • Half Marathon

    21.1 km · 13.1 mi

    1:30–2:30 h

  • This race

    29 km · 18 mi

  • Marathon

    42.2 km · 26.2 mi

    3–5 h

  • Ultra

    50 km+

    6 h+

Terrain Types

  • Road

    Paved surfaces

    Road races are run on asphalt or concrete. They offer consistent, predictable surfaces ideal for fast times and personal records.

  • Trail

    Natural terrain

    This race

    Trail races take you off-road onto dirt paths, rocks, roots, and varied surfaces. They require trail shoes with grip and more attention to foot placement.

  • Track

    Laps of a 400 m oval

    Track races are run lap after lap on a synthetic 400 m oval. The distance is exact and the surface is the same everywhere, so times compare better than anywhere else. Most runners race in spikes or light racing shoes.

  • Cross country

    Grass, mud and loops

    Cross country races are run on grass, mud and park paths, often over several laps of a marked loop. Many runners race them in spikes, and placings count more than times.

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