Doomsday 5K

First comes fall, then comes winter, and before you know it we're all flipping the calendar to a brand new year.

Crazy to think that in 4-ish months we'll be stepping into Day Onr of 2027....AND if you want to kick off that first day with something bold, unforgettable, and downright epic, the Doomsday 5K needs to be on your to-do list.

💥 5th annual Doomsday 5K is officially open for online registration 🙌

👉 Spots are limited, the hype is real, and the countdown to Doomsday has already begun.

Lace up, sign up, and start the new year with a run that sets the tone for everything that comes next.

📅 Friday, January 1, 2027
📍 Cliff Cave County Park
🕑 10AM


👉 Be sure to check out all the discounts available on our website.
www.terraintrailrunners.com (FAQ)


Registration 🔗
https://ultrasignup.com/register.aspx?did=140486


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That's a W.R.A.P on the 4nd Annual Doomsday 5K Trail Race !

👉 Race Results: https://ultrasignup.com/results_event.aspx?did=129265
👉 Photos: https://photos.app.goo.gl/TiS7cTZxf3wdRNVJA

📸Elaine Collins

Thank you for joining us and kicking off your New Year’s Day with Terrain Trail Runners-STL. We love starting the year on the trails with you.

💥Save the Date:
Doomsday 5K returns Friday, January 1, 2027.

👉Registration opens early September 2026.

Have an amazing 2026 racing season!

Terrain Trail Runners STL - Doomsday 5K at Cliff Cave Park · Dec 31, 2025 – Jan 3, 2026 📸 Shared album · Tap to view!

✨Some highlights from the 4th Annual Doomsday 5K!

No better way to kick off the New Year than lacing up, showing up, and running into 2026 with this amazing community.

🏃‍♀️🏃‍♂️ Thanks to everyone who kicked off 2026 with Doomsday 5K in full sprint 💥 🙌


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🏃‍♀️🏃‍♂️

HEADS UP!

👉 Bib numbers have been assigned, and the race day information email is OUT!

Check your inbox and your SPAM folder.

If you still don't see the pre-race email, shoot us a message at [email protected] and we'll get you taken care of.

Can't wait to kick off the new year with you on January 1st!

LET'S GO!! 🏃‍♀️🔥🏃‍♂️

🎉 👟 The countdown is ON!
In just 2-ish weeks New Year will come knocking and we'll be ready to kick it off STRONG with the Doomsday 5K on New Year's Day! 💥
✨️ Start 2026 on the right path: Lace up, run with us, and make it a family affair.
📅 January 1, 2026
📍 Cliff Cave County Park, St. Louis, MO
🕑 10AM


⌛️ ONLINE REGISTRATION CLOSES AFTER DECEMBER 28 - Don't wait!


Registration 🔗 ⬇️
https://ultrasignup.com/register.aspx?did=129265


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✨️ 🏃‍♀️🏃‍♂️ It's officially December 1, which means the countdown is on ⌛️
👉 You have until December 28, 2025 to sign up for Doomsday 5K and kick off the New Year on the right foot....AKA trail running 🌲 👟 👟

💥 Start 2026 strong 💪 🙌 by committing to yourself on January 1st.

Join Terrain Trail Runners-STL for the 4th annual Doomsday 5K and celebrate 🥳 🎉 the new year where it belongs - on the trails.

📅 January 1, 2026
📍 Cliff Cave County Park, St. Louis, MO


Sign up 🔗 https://ultrasignup.com/register.aspx?did=129265


👉👉 Let's make the first miles of the year unforgettable ✨️
WHO'S READY TO RUN INTO 2026?!!

Ready to make plans for January 1, 2026?!!

👉 Online race registration for the 4th year running of Doomsday 5K is now OPEN!

Sign up here:

Doomsday 5K Register Now!

Psst... 👀

Did you know we're just 4-ish months away from a brand new?

👉 You know what that means - time to set fresh goals and kick off 2026 with a bang 💥

🎉 Doomsday 5K is BACK!

Online registration for the 2026 edition opens September 1, 2025.

✅️ Race will be capped at 75 runners
✅️ NO price increases
✅️ Race Day Registration will be available
✅️ First come, first served

Start your year strong. Start it with Doomsday. 🏃‍♀️🏃‍♂️ 🙌


🏃‍♀️🏃‍♂️ #2026