December 7, 2025
Travis County Expo Center
Half Marathon
5K
Marathon Kids Mile
The Decker Challenge returns for its 47th year on December 7, 2025, continuing its legacy as one of Austin’s most challenging and rewarding half marathons. Known for its hilly terrain, this competitive race draws seasoned runners seeking to test their limits.
Alongside the half marathon, the event offers a fun 5K, perfect for those looking for a shorter distance with the same spirited atmosphere. And not forgetting our young runners, the Kids Mile makes it a complete family affair, ensuring everyone can join in the running fun.
The Decker Challenge tradition continues — but this year, we’re turning up the magic.
Every Half Marathon finisher will earn a special edition medal that changes color in sunlight. It’s bold, eye-catching, and unlike anything you’ve seen before — the perfect reward for conquering Austin’s most challenging course.
This year’s race shirt is a true game-changer. The Magic 4-in-1 Long Sleeve Tee transforms before your eyes — colors shift under sunlight, and hidden messages appear when you sweat or when the fabric gets wet. It’s performance apparel with personality, designed to move (and change) with you every mile of the way.
Both the medal and shirt celebrate what makes Decker special — a race that pushes your limits, surprises you at every turn, and rewards you for leaving it all on the course.
