Why You’re So Tired in the Mountains: Understanding Oxygen and Altitude

You're not alone. Many visitors to high-altitude destinations like Dillon, Breckenridge, Keystone, and Copper Mountain notice an unexpected drop in energy. That’s not just your imagination—it’s science.

Let’s break down why altitude affects your energy levels and what you can do about it.

What Happens to Your Body at High Altitude?

At elevations above 8,000 feet—like most towns in Summit County—the air contains less oxygen per breath than it does at sea level. Your body has to work harder to get the oxygen it needs, especially during physical activity.

Symptoms of Altitude Adjustment Include:

• Fatigue or drowsiness

• Headache

• Dizziness or lightheadedness

• Shortness of breath, even with mild exertion

• Trouble sleeping

• Nausea