Austin Solstice Circuit 52 Miler • 50K • Marathon • 25K • 10K • 5K • 12-Hour Relay 2026

About Austin Solstice Circuit 52 Miler • 50K • Marathon • 25K • 10K • 5K • 12-Hour Relay

Austin Solstice Circuit Challenge

The Fastest Summer Ultramarathon in Texas

July 25 & 26, 2026 | Pace Bend Park, Lake Travis

Set a Summer PR!

Scenic Hill Country Course

Experience the breathtaking beauty of the Texas Hill Country as you run on smooth paved roads winding through majestic oak trees. With Lake Travis as your backdrop, this picturesque route combines natural beauty with the perfect running surface for speed and comfort.

Set your sights on a personal record at the Austin Solstice Circuit Challenge. This unique event features a perfectly engineered 1.64-mile paved loop with an elevation gain of just 33ft at scenic Pace Bend Park on Lake Travis, designed for speed and performance even in July.

Race Distances

52.7 Mile Race

Loops: 32

Distance: 52.7 mi

Start: 7:00 PM 07/25

50K

Loops: 19

Distance: 31.0 mi

Start: 7:00 PM 07/25

Marathon (USATF Certification code: TX25015LAB)

Loops: 16

Distance: 26.35 mi

Start: 7:00 PM 07/25

25K

Loops: 10

Distance: 15.5 mi

Start: 7:00 PM 07/25; 7:00AM 07/26

10K

Loops: 4

Distance: 6.2 mi

Start: 7:00 PM 07/25; 7:00 AM 07/26

5K

Loops: 2

Distance: 3.1 mi

Start: 7:00 PM 07/25 7:00 AM 07/26

12-Hour Relay

2-Person Teams The Ultimate Night-Shift Team Challenge.

Grab your teammate and conquer the dark together.

Start: 7:00 PM 07/25

Why Choose This Race?

Fast, PR-Friendly USATF Certified Marathon Course (Boston Qualifier)

Unlike typical Texas summer ultras with brutal heat and technical trails, our smooth asphalt loop with minimal elevation gain creates ideal conditions for record-setting performances. This is a USATF-certified course: Certification code: TX25015LAB.

Evening Start Format

Race as the sun sets and July's magnificent Buck Moon rises over the limestone bluffs. Our strategic evening start times for longer distances mean cooler temperatures when you need it most.

Pacers Allowed

While we won't be providing official pacing groups for the Austin Solstice Circuit Challenge due to our size, we enthusiastically welcome personal pacers for both the Marathon, 50K and 52.7 Mile Solo events. Personal pacers can join Marathon and 50K participants after 8 loops and 52.7 Mile runners after 16 loops (approximately halfway points). Each pacer must pay a $15 fee that covers park entry, administrative costs, and an official pacer bib. Pacers need to sign a waiver and wear their designated "PACER" bib while on course. Runners are responsible for arranging their own pacers, but the loop format makes it particularly convenient for your support crew to join when you need them most. We find this flexibility is especially appreciated by first-time marathoners and ultra runners who benefit from personalized support during the challenging later miles as day turns to evening.

Pickup Information:

Saturday Packet Pickup:

Available from 4:30 PM to 6:30 PM.

Race Day Pickup:

For those unable to attend on Saturday or who prefer to pick up on race day, same-day packet pickup will be available Sunday morning from 5:30 AM to 6:30 AM.

12-Hour Overnight Relay (2-Person Teams)

Smash out alternating single loops, swap out every hour, or split the night into two massive blocks; your team controls the strategy.

The relay kicks off at 7:00 PM Saturday and ends exactly at 7:00 AM Sunday. All transitions take place right at the main canopy timing mat next to the team layout area. You will pass off your team's timing chip to your partner to trigger the next leg.

Team Registration: The first member to sign up will create the team name and pay the full registration fee. Teammate Invite: Once the team is created, the second member can register and join the roster. (Note: You can choose to split the cost evenly through RunSignup’s automatic split-pricing feature at checkout!) What’s Included: Every single relay participant receives a finisher medal, custom race swag, and full access to the overnight aid hub support.

Maximum Roster: Strictly