Racing Gravel at Altitude: How to Adjust Your Power, Pacing, Heart Rate and Fueling

You’ve trained. You know your FTP. You know your heart-rate zones. You have your pacing plan dialed.

Then you show up to race gravel at 7,000 feet and suddenly the numbers don’t make sense.

The watts you normally hold feel harder. Your breathing is elevated. Your heart rate may not behave the way you expect. And if you try to force the numbers you ride at home, you can put yourself in a hole surprisingly early.

Here’s the first thing I want athletes to understand:

Your fitness didn’t suddenly disappear. The environment changed.

At altitude, the partial pressure of oxygen is lower. That means less oxygen is available to your body with each breath, which can reduce aerobic performance—particularly during sustained, higher-intensity efforts.

For gravel racers, that changes how we should think about power, heart rate, pacing, fueling and race-day expectations.

1. Stop Chasing Your Normal Power

One of the biggest mistakes you can make at altitude is trying to prove that your FTP is still your FTP.

You may look down on the first climb, see numbers you know you can hold at home and think:

I should be able to do this.

Maybe you can—for a while.

But the metabolic cost of producing that power may be higher at altitude, particularly if you aren't acclimatized.

Instead of forcing a predetermined wattage, pay attention to what that power is costing you.

Ask yourself:

What does my breathing feel like? What is my heart rate doing? What is my RPE? Is this effort sustainable for the amount of racing I still have left?

Your power meter is still incredibly valuable. You just need to interpret the number in the environment you're racing in.

2. Heart Rate Can Be Different Too

Heart rate is another piece of the puzzle—but don't assume it will behave exactly as it does at home.

During submaximal exercise, particularly soon after arriving at altitude, you may see a higher heart rate for a given workload as your cardiovascular system works to compensate for reduced oxygen availability.

But here's where it gets interesting:

At higher intensities and elevations, your maximal heart rate may actually be lower than what you're accustomed to seeing at lower elevation.

So simply deciding, I'll race by heart rate instead of power, doesn't solve the problem.

This is why I like athletes to use three pieces of information together:

POWER + HEART RATE + RPE

Your power meter tells you what you're producing.

Your heart rate gives you information about your body's response.

Your perceived exertion and breathing tell you how expensive that effort feels.

When all three are telling you that you're working too hard, listen.

3. Start More Conservatively Than You Think

This might be the most important race-day advice I can give you.

Do not race the first climb with your ego.

Gravel starts can be chaotic. Everyone feels good. People surge. Groups form. You don't want to lose the wheel.

At altitude, that's an easy way to spend matches you desperately want four hours later.

If your breathing is already out of control early in the race, back off.

Shift down.

Let the cadence come up.

Control the effort.

And yes, sometimes that means letting a wheel go.

There is a huge difference between being uncomfortable because you're racing and going so far above your sustainable effort that you're compromising the rest of your day.

Altitude tends to make that line more important.

You don't have to win the first climb. You need to still be racing well on the last one.

4. Use Gearing to Control the Effort

This is something gravel racers often overlook.

When oxygen availability is reduced, repeatedly grinding a big gear or punching every short climb can become expensive.

Use your gears.

Rather than muscling over every roller, shift earlier and find a cadence that allows you to keep your breathing and effort under control.

That doesn't mean you need to spin wildly up every climb.

It means avoiding unnecessary spikes in effort.

Think of your energy like a box of matches.

Every surge, attack, steep pitch and effort above threshold burns one.

At altitude, you may have fewer matches available—or those matches may cost more.

Spend them intentionally.

5. Fuel Early—Even If You Don't Feel Hungry

Altitude can affect appetite, and the combination of altitude, dry air, nerves and hard racing can make it surprisingly easy to fall behind on both fueling and hydration.

Don't wait until you feel hungry.

For longer gravel racing, many athletes will target somewhere around 60–90 grams of carbohydrate per hour, with higher intakes possible for athletes who have specifically trained their gut for them.

Start early.

Stay consistent.

And remember that your fueling plan needs to work with the terrain.

If the course is rough and you're unlikely to be opening gels or eating solid food frequently, consider putting a significant portion of your carbohydrates into your bottles or hydration pack.

Then carry gels or other easy fuel for smoother sections and as backup.

The best nutrition strategy isn't just one that looks good on paper.

It's one you can actually execute while riding the course.

6. Don't Confuse Fueling With Hydration

This is especially important if you're using a high-carbohydrate bottle or hydration pack.

Your bottle may contain enough carbohydrate for three hours.

That doesn't necessarily mean it contains enough fluid for three hours.

Dry mountain air, increased ventilation and environmental conditions can all affect fluid needs.

So separate the two questions:

How many carbohydrates do I need per hour?

And:

How much fluid do I need per hour under today's conditions?

If you need more fluid than your concentrated carbohydrate bottle or pack provides, supplement with additional water or an appropriate electrolyte drink rather than simply consuming your concentrated fuel faster.

Fuel to your carbohydrate needs. Hydrate to your fluid needs.

7. Acclimatization Takes Time

Showing up two days before a high-altitude race doesn't suddenly make you acclimatized.

Your body begins responding to altitude relatively quickly, but meaningful acclimatization develops over days and continues over a longer period.

If you have the opportunity to spend significant time at altitude before your event, that can be valuable.

If you don't, don't panic.

Focus on what you can control:

Sleep well.

Arrive hydrated.

Fuel properly.

Keep the first part of the race under control.

And most importantly, understand how your body responds to altitude.

There isn't one perfect arrival strategy for every athlete. Travel demands, elevation, previous altitude exposure and individual response all matter.

8. Adjust Your Expectations Before the Start Line

This may be more important than adjusting your power targets.

If you arrive expecting to reproduce every number you see at home, it's easy to interpret lower power as a bad day.

Then you push harder trying to “fix” it.

That's exactly what you don't want to do.

Your FTP didn't disappear.

Your training didn't disappear.

Your fitness didn't disappear.

You're performing in a different environment.

The athlete who recognizes that early has a huge advantage over the athlete who spends the first two hours fighting it.

The Gravel Method Takeaway

When you're racing gravel at altitude, don't let one number dictate your day.

Use power, heart rate and RPE together.

Start conservatively.

Control your effort on the early climbs.

Shift before you're forced to.

Fuel and hydrate early.

Expect your numbers to look different.

And save your matches for the part of the race where they actually matter.

Because altitude doesn't care what your FTP is at home.

Race the body you have that day—not the numbers you think you should have.