Colorado Springs altitude: what your first two weeks feel like

Colorado Springs sits at 6,035 feet. Every breath here delivers roughly 80% of the oxygen you'd get at sea level, and your body notices the first afternoon. New arrivals wake up dry-mouthed at 4 a.m., feel a low-grade headache by lunch, and get winded on stairs they'd usually take two at a time.

That's physiology negotiating a new baseline, and it clears on a schedule. Most people feel roughly normal within a week, sleep normally within two, and fully acclimate over four to six.

Here's what to expect, what to watch for, and what to change about how you eat, drink, sleep, and move.

What 6,035 feet does to your body

At Colorado Springs elevation, atmospheric pressure sits at about 80% of sea-level pressure. Every breath delivers less oxygen, and your body responds in two phases.

In the first hours and days, you breathe faster and deeper. Resting heart rate ticks up a handful of beats per minute. Your kidneys start dumping water to raise blood pH, which is why you pee more the first two days. That's compensation, not illness.

Over the next few weeks, your body starts producing more red blood cells to carry oxygen more efficiently. This is the phase athletes chase when they train at altitude. It takes three to four weeks to plateau.

The Wilderness Medical Society clinical practice guidelines put the acute-mountain-sickness risk threshold at roughly 2,500 meters (about 8,200 feet). Colorado Springs sits below that, so serious altitude illness stays rare here. Mild symptoms are another matter.

In the first 48 hours, most people get some subset of the following:

• A mild-to-moderate headache, often worse in the afternoon.
• Poor or fragmented sleep, especially waking around 3 to 5 a.m.
• Feeling winded on stairs or short walks uphill.
• More urination and more thirst.
• Reduced appetite.
• A background fatigue that a nap doesn't quite fix.

If those symptoms fade over three to five days, you're on the normal curve.

The first 72 hours

The three days after you land are the most physically eventful. Six things help.

Hydrate more than you think you need to. At altitude, you lose water through faster breathing and increased urination. Aim for three liters of water on a moving day, and roughly the same each of the next two days. Add electrolytes if you're active.

Cut alcohol to zero, or close. The CDC advises avoiding alcohol for the first 48 hours at high altitude. It compounds dehydration and disrupts the sleep architecture your body is already fighting.

Slow down. No hard workouts. Walk at a conversational pace for a couple of days. Even the fitness center can wait 48 hours if you're feeling rough.

Eat carb-heavy meals. Carbs use less oxygen to metabolize than fat or protein does. Bagels, pasta, rice, and potatoes go down easier during the adjustment window.

Sleep with the window slightly cracked. More airflow helps some people. A humidifier in the bedroom helps almost everyone, and that gets its own section below.

Go easy on caffeine. Cutting your normal coffee intake by half for the first two days makes the headache manageable. You can ramp back up as symptoms resolve.

Sleep at altitude

Sleep at 6,000 feet is genuinely different, and it's the symptom people underestimate before they arrive.

The mechanism is periodic breathing, a normal altitude response where breathing cycles through faster and slower phases while you sleep. It's your body's chemoreceptors chasing the right oxygen and CO2 balance, and it isn't sleep apnea. The consequence: fragmented sleep, especially in the first week. You may wake at 3 a.m. feeling short of breath, then fall back asleep within a few minutes.

Colorado Springs is also unusually dry. Indoor humidity in winter routinely drops below 25%, and even summer runs 30 to 40% inside a heated or cooled apartment. Dry air disrupts sleep on its own, quite apart from the altitude effect.

A short list of what actually helps:

• A cool-mist humidifier in the bedroom, run overnight. Target 40 to 50% relative humidity.
• A glass of water on the nightstand for the 3 a.m. wake-up.
• Blackout curtains. Colorado's high-elevation sunlight is intense at sunrise, and light discipline matters more when your sleep is already stressed.
• An extra pillow. Sleeping slightly elevated helps some people with the breathing pattern.
• No sleep aids in the first week. Diphenhydramine (Benadryl, ZzzQuil) and prescription sedatives can dampen the ventilatory response and worsen periodic breathing. Talk to a doctor before continuing anything you rely on.

Full sleep normalization takes most people 7 to 14 days.

Exercising in the first two weeks

Exercise at altitude works differently. Your aerobic ceiling drops by several percent at 6,000 feet and by more the harder you push. Perceived effort at any given pace goes up. Recovery takes longer.

A reasonable ramp for the first two weeks:

• Days 1 to 3: walking only. Flat routes. 20 to 40 minutes.
• Days 4 to 7: light cardio. About two-thirds of what you'd do at sea level.
• Days 8 to 14: add strength work. Cardio at 80% of your usual load. Skip anything above threshold intensity.
• Weeks 3 to 4: back to full training with attention to hydration and sleep.

Runners and cyclists who train seriously will feel the effect for four to six weeks. VO2 max is genuinely lower here for the first month. You can still train hard. But the pace or power targets that felt easy at sea level are threshold work here.

Watch for symptoms that aren't clearing with rest: chest tightness, coughing during or after workouts, unusual fatigue that lasts multiple days, breathlessness at rest. Those warrant a call to a doctor before your next session.

Alcohol, caffeine, and altitude

Alcohol hits harder at altitude. A single drink at 6,000 feet feels closer to a drink and a half at sea level. Two things going on at once: dehydration compounds faster, and alcohol suppresses your ventilatory response, so the effect of already-reduced oxygen gets worse.

For the first two weeks, cut your usual intake in half, hydrate between drinks, and don't drink within four hours of bed if you're still adjusting.

Caffeine is fine, though a full sea-level dose in someone whose sleep is already fragmented compounds the sleep problem. Cutting afternoon coffee for the first two weeks tends to smooth out the adjustment.

UV and dry skin

Colorado Springs sits under thinner atmosphere than lower elevations. The EPA puts UV intensity at about 6% higher per kilometer of elevation, which puts Colorado Springs roughly 11% above sea level at the same latitude. On clear summer days it's easy to burn in 20 minutes. Even winter has enough UV that snow-reflected light burns cheeks and noses.

The habits that work:

• Sunscreen on face, ears, and hands every day, year-round. SPF 30 minimum.
• Sunglasses whenever it's bright, including overcast days.
• Lip balm with SPF. The dry air chaps lips in about a day.

Skin gets dry fast. Face lotion after showering helps. Body lotion within the first week. Consider a hand cream for the first month if your hands are cracking.

Kids and pets

Kids acclimate faster than adults on average. Same symptoms in the first 48 hours: headache, fussiness, appetite loss, disrupted sleep. Push fluids, keep meals carb-heavy, and cap activity for the first few days. Babies under 18 months sometimes take slightly longer to normalize their sleep. Pediatricians here are used to the adjustment. Call yours if anything looks off.

Dogs adjust in two to four days. Cats barely notice. For dogs especially, hydration and shorter walks for the first week matter. Fetch on the first Saturday is fine. Hard hikes above 8,000 feet are worth waiting a week on.

When to see a doctor

Most altitude symptoms in Colorado Springs go away on their own. Some symptoms warrant medical attention, though. Urgent care or an emergency department if any of these show up:

• A headache that hasn't cleared after 5 days, or is severe enough to interfere with normal activity.
• Chest pain, especially with exertion.
• Coughing pink or frothy sputum, or a productive cough with wheezing.
• Confusion, unusual clumsiness, or difficulty walking straight.
• Shortness of breath at rest, not just on exertion.
• A blueish tint to lips or fingertips.

Those point to conditions well above the mild-AMS bucket. Colorado Springs has multiple urgent care and ER options within a mile of downtown; UCHealth Memorial Central and Penrose Hospital both handle altitude-related presentations regularly.

Two weeks in, most people feel normal. Four weeks in, most people forget they're at altitude. Six weeks in, you're the one telling the next new arrival to hydrate and go easy on the stairs.

If you're settling in downtown, the neighborhood guide covers the practical side of getting oriented. If you're a service member landing at Fort Carson or Peterson SFB, the PCS playbook covers the housing and BAH side of the same first two weeks.