Big Bastrop Backyard Ultra

DEC
31
2027
A backyard ultra at Lake Bastrop on Dec 31, 2027 where runners repeat a 4.167-mile loop each hour until one runner completes a solo final loop.
Fri 31 Dec 2027
4 miles

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Big Bastrop Backyard Ultra : Lake Bastrop South Shore Park, Bastrop TX, December 31, 2027

Big Bastrop Backyard Ultra is a last-one-standing backyard ultra held at Lake Bastrop South Shore Park. The event uses a repeating loop format: each loop is 4.167 miles on the Gideon Loop via Swift Trail. Runners complete one loop each hour and the race continues until a single runner starts and completes a final loop alone.

The course is trail-based with rolling terrain, moderate elevation changes (about 141 feet of gain per loop), a mix of single-track and wider trail sections, lakeside views, and loblolly pine forest. Aid stations are placed about every 2.1 miles, with full support at the start/finish area. Night running makes up most of the event; a headlamp and backup light are required and additional night gear is mandatory during the designated night portion.

The prize structure awards the last runner standing a trophy and a stipend of $2 per mile covered, rounded to the nearest dollar. A complimentary entry to the next race on the circuit is offered to the official winner under the event’s rules. There is also a Loblolly Redemption loop for runners who miss a bell; that loop is 5.1 km and is entered only by being sent there during the race.

Registration benefits include a custom finisher award, race shirt (if registered by December 1), official results and certificate, stocked aid stations, food and medical support, and race photography. Park entry fees apply for non-registered spectators and crew, and transfers are allowed only at the race director’s discretion. Visit the organization's website for the most recent information.

Events nearby

Trail running at Buescher State Park on December 12, 2026, with multiple distances including a 104K and a 4 Person Relay.
Multi-distance trail weekend at Lake Bastrop offering races from 5K to 250K, ruck divisions, lap-format ultras with fixed cutoffs, and full aid station support.
Trail races at Bastrop State Park: 7K, 20K, 40K, 60K, 100K and 20K ruck on scenic dirt single-track with about 800 ft elevation per 20K loop.
Trail races from 10k to 50 mile at Rocky Hill Ranch in Smithville Texas on April 3, 2027. Single track course with marked aid stations and a cupless policy.
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