12 Mistakes Every Beginner Ultra Runner Makes (and How to Avoid Them)

We asked 200+ ultra runners one question: "What was your biggest mistake in your first ultra?" These 12 answers came up again and again.

1. Starting Too Fast

The #1 mistake, mentioned by 73% of respondents. The adrenaline of race day makes your planned pace feel easy. Then mile 25 hits and you're walking.

Fix: Run the first 10 miles 15-20% slower than your planned pace. You'll thank yourself later.

2. Not Practicing Nutrition

Your stomach needs training just like your legs. If you've never eaten 250 calories per hour while running, race day is not the time to start.

Fix: Practice your exact race nutrition plan on every long run over 15 miles.

3. New Gear on Race Day

New shoes, new socks, new vest — all recipes for blisters, chafing, and misery.

Fix: Test every piece of gear on at least 2 long runs before race day.

4. Ignoring the Weather Forecast

Packing for the weather you want instead of the weather you'll get.

Fix: Check the forecast 3 days out and pack for the worst-case scenario.

5. Skipping the Taper

Running hard up until race week because you "don't feel ready."

Fix: Trust the training. Cut volume 40% two weeks out and 60% the final week.

6. Not Training on Similar Terrain

Running road miles and expecting them to translate to rocky trails.

Fix: At least 50% of your training should be on terrain similar to your race course.

7. Forgetting Body Glide

Ultra-distance chafing is in a different universe than marathon chafing.

Fix: Apply anti-chafe to every skin fold, crease, and contact point. Reapply at every crew access.

8. Sitting Too Long at Aid Stations

Aid stations are comfortable. That's the trap.

Fix: Set a 3-minute maximum at aid stations. Get in, refuel, get out.

9. No Plan for the Low Points

Every ultra has a dark patch. If your only plan is "push through it," you'll probably DNF.

Fix: Have specific strategies: call someone, change your music, eat something salty, walk for 10 minutes.

10. Carrying Too Much Weight

Stuffing your vest with "just in case" items that you never use.

Fix: Lay out everything you plan to carry. Remove half of it. You probably still have too much.

11. Not Training Downhills

Downhill running destroys your quads in ways that flat running never prepares you for.

Fix: Include at least one hilly long run per week in the last 8 weeks of training.

12. Comparing Yourself to Others

Ultra running attracts competitive people. But your first ultra is about finishing, not placing.

Fix: Run your own race. Walk when you need to. Enjoy the experience. The time doesn't matter.