Marble Falls Triathlon

Date: Last held Jul 26, 2026, next date to be announced
Location: Marble Falls, Texas

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The swim at Marble Falls Triathlon

This is an open water swim at Lake Marble Falls. The organizer's wetsuit note: water typically 80-84 F on race day, so not wetsuit legal for award eligibility.

From the organizer's own race information (source). Venues and rules can change from year to year; the race's current athlete guide decides.

Water temperature and wetsuits at Marble Falls Triathlon

Around July 26, Lake Marble Falls typically runs about 86°F at the surface (85 to 88°F across 2011 to 2020). The water usually runs 84°F or warmer at this date, when wetsuits are not allowed.

A model estimate from the USGS lake temperature model (daily surface temperatures for US lakes), not a measurement. Wetsuit cutoffs are USA Triathlon age-group rules. The race's own water temperature reading on race morning decides.

Start location and course

Lake Marble Falls, Marble Falls, TX 78654

Directions to the start

The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.

Where Marble Falls Triathlon ranks

No. 9 of 50 on Warmest triathlon swims

National lists computed from results, entry fees, course maps and water temperatures; they refresh through the day.

Race details

Where: Lake Marble Falls, Marble Falls, TX 78654Map
Course: Road
Distances: Triathlon
Editions: 2026 (Jul 26, 2026), 2025 (Jul 27, 2025), 2024 (Jul 28, 2024), 2023 (Jul 30, 2023)
Status: The next edition has not been announced yet. Past events: Marble Falls Triathlon, Marble Falls Triathlon, Marble Falls Triathlon, Marble Falls Triathlon.

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