The 12-Day Everest Base Camp Trek: A Health-Smart Itinerary
A health-smart 12-day Everest Base Camp trek flies into Lukla (2,860 m), then climbs in deliberate steps to Base Camp at 5,364 m (17,598 ft), with built-in acclimatization days at Namche Bazaar and Dingboche. Altitude, not fitness, is what ends most attempts: the CDC reports acute mountain sickness rates approaching 30 to 40 percent on routes where rapid ascent is unavoidable. The plan that works keeps sleeping-altitude gains under about 500 m per night above 3,000 m, uses climb-high-sleep-low day hikes, and most travelers should consider starting acetazolamide the day before the climb begins. Speak with a provider about a kit before you fly.
I have treated enough returning trekkers in the ER to know that the Everest Base Camp trek is not won by the strong. It is won by the patient. The people who get into trouble are rarely the least fit. They are the ones who treated 5,364 m like a finish line and raced the mountain to get there. This 12-day itinerary is built the other way around, with altitude as the organizing principle. Every rest day, every short stage, and every "why are we stopping already" moment is there to keep your brain and lungs ahead of the climb. Do that, and the views take care of themselves.
Who this itinerary is for
This is a first-timer's Base Camp plan with margin built in. If you have never slept above 4,000 m, this is the version of the trek I would want a family member to do, because the two acclimatization days and the modest daily gains do most of the protective work for you. You should be able to walk five to eight hours a day on consecutive days, but you do not need technical mountaineering skills. There is no rope, no crampons, no ice on a standard Base Camp route.
Returning trekkers and the very fit are welcome too, with one caution. Fitness buys you nothing against altitude. The Khumbu is unusual in that the standard approach forces a relatively quick gain to real elevation, which is exactly why the CDC singles out Everest routes as ones that push the limits of many people's ability to acclimatize. Respect the schedule even if your legs feel fresh.
The route
The trek is an out-and-back along the Dudh Koshi and Khumbu valleys, roughly 130 km (about 80 miles) round-trip from Lukla. You fly into Lukla at 2,860 m, which is itself a serious starting altitude, then walk north and up in deliberate steps. The genius of the classic route is its rhythm: gain, then pause, then gain again.
The waypoints climb in a staircase. Namche Bazaar (3,440 m) is the Sherpa hub where you take your first acclimatization day. Tengboche (3,860 m) brings the monastery and your first commanding view of Everest, Lhotse, and the spire of Ama Dablam. Dingboche (4,410 m) is your second acclimatization base, sitting in the wide Imja Valley above the treeline. From there the air thins fast through Lobuche (4,910 m) and Gorak Shep (5,140 m), your launch points for Base Camp itself at 5,364 m and the Kala Patthar viewpoint at 5,545 m. Then you turn around and descend the same valleys, which is when most people finally relax and enjoy the walk.
Day-by-day plan
Day 1: Fly to Lukla, trek to Phakding
The trip starts with one of the most famous short flights in the world, from Kathmandu into the mountain airstrip at Lukla (2,860 m). From there you walk gently downhill to Phakding (2,610 m). It is an intentionally easy first day. Your body just arrived at altitude, so the priority is hydration and an unhurried pace, not mileage.
Day 2: Phakding to Namche Bazaar
Today you cross a series of suspension bridges over the Dudh Koshi and grind up a steep forested climb into Namche Bazaar (3,440 m). The day gains roughly 830 m, which makes it the first genuine altitude test of the trek. Take the final ascent slowly. A headache or breathlessness here is your body telling you it is working, and the correct response is to ease off, not to power through.
Day 3: Namche Bazaar acclimatization day
Your first rest day is not idle. You day-hike up toward the Everest View Hotel and the village of Khumjung at around 3,880 m, then come back down to sleep in Namche at 3,440 m. This climb-high-sleep-low pattern is the core acclimatization tactic, and it is far more effective than simply sitting still. You also get your first proper look at Everest on a clear morning.
Day 4: Namche to Tengboche
A beautiful contouring trail with big mountain views leads to a descent to the river, then a climb to the monastery at Tengboche (3,860 m). The net gain to sleep is a comfortable 420 m or so. Start paying attention now to your two best early-warning signals: how your head feels, and how well you sleep. Disrupted sleep is one of the most common first signs of mild altitude illness.
Day 5: Tengboche to Dingboche
You pass through Pangboche and climb into the broad, treeless Imja Valley to Dingboche (4,410 m), gaining roughly 550 m. Many trekkers notice their appetite fade and their sleep get patchy at this elevation. That is normal physiology, not a reason to speed up. Eat what you can, drink more than feels necessary, and trust the schedule.
Day 6: Dingboche acclimatization day
This is the most important day on the calendar. You hike up the Nangkartshang ridge toward 5,000 m, take in the view, and then descend to sleep again at 4,410 m. Spending waking hours high and sleeping low is what makes the final push tolerable. If I could protect only one rest day on this whole itinerary, it would be this one.
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Day 7: Dingboche to Lobuche
The trail climbs past the poignant Thukla memorials to climbers who died on Everest, then follows the lateral moraine of the Khumbu Glacier to Lobuche (4,910 m). The air is thin and cold and the mood turns serious. Keep the day's gain modest and report any worsening headache, nausea, or unsteadiness to your guide right away rather than at the next tea house.
Day 8: Lobuche to Gorak Shep and Everest Base Camp
The big day. You trek to Gorak Shep (5,140 m), drop your pack, and continue out to Everest Base Camp at 5,364 m (17,598 ft) before returning to Gorak Shep to sleep. The smart design here is that you touch the high point but sleep lower. This is also the day to be most honest with yourself. Confusion, breathlessness at rest, or a wet cough are not "push through it" symptoms. They are descent symptoms.
Day 9: Kala Patthar sunrise, descend to Pheriche
A cold pre-dawn climb to Kala Patthar (5,545 m) delivers the classic panorama of Everest's summit pyramid, the single best viewpoint on the trek. Then you descend hard, roughly 1,200 m, to sleep at Pheriche (4,370 m). Descent is the most reliable altitude treatment there is, and most trekkers feel dramatically better by that evening as oxygen returns.
Day 10: Pheriche to Namche Bazaar
You retrace the trail back below the treeline to the relative luxury of Namche Bazaar (3,440 m). Lingering altitude symptoms should fade as you lose elevation. If anything is still worsening rather than improving, the answer is the same as it always is up high: keep descending and seek care.
Day 11: Namche to Lukla
A long final descent down the Dudh Koshi valley returns you to Lukla (2,860 m). At this point the challenge is your knees, not your lungs. Trekking poles and a controlled downhill cadence go a long way toward protecting your joints on the steep, stony sections.
Day 12: Fly Lukla to Kathmandu
A morning mountain flight carries you back to Kathmandu. Lukla flights are notoriously weather-dependent and delays are common, so never schedule an international connection for the same day. Build in at least one buffer day in Kathmandu at the end of the trip.
Health prep for this trip
The trek is an altitude trip first and everything else second, so prep starts with how you will handle thin air. Most travelers should consider starting acetazolamide the day before ascending past Lukla. The CDC Yellow Book describes a typical adult prophylactic dose of 125 mg twice daily, and advises a low threshold for preventive use specifically on Everest routes. Acetazolamide helps your body acclimatize faster rather than hiding symptoms, so it works with your itinerary, not instead of it. Because it is a sulfa-based drug, confirm it is appropriate for you with a provider. You can read more on our acetazolamide page.
Pack a plan for the unglamorous problems too. Nausea and vomiting at altitude are both common and dangerous, because they drive dehydration that makes everything worse, so an anti-nausea medication like ondansetron earns its place in the kit; see our ondansetron overview. Bundle the altitude essentials together rather than piecing it out, our Nepal Himalayan Trek travel pack is built for exactly this route. For routine protection, a travel clinic should cover Hepatitis A and Typhoid roughly six to eight weeks out; the CDC's general guidance for the country is summarized on our Nepal destination guide. Whatever you carry, the non-negotiable rule stands: for the dangerous forms of altitude illness, the treatment is to go down.
What to pack
Layered clothing for a 30-plus degree daily temperature swing, a four-season sleeping bag, broken-in boots, trekking poles, high-SPF sunscreen and glacier-rated sunglasses (UV is brutal at altitude), a wide-brim hat and warm hat, a headlamp for the Kala Patthar pre-dawn start, water treatment, and your altitude and stomach kit. Cash in Nepali rupees, because there are no reliable ATMs once you leave Namche.
Best time to go and what to avoid
Two windows stand out. Spring, March to May, brings warming temperatures and blooming rhododendron forests lower on the trail, plus the buzz of climbing expeditions staging at Base Camp. Autumn, late September to November, delivers the most stable weather and clearest skies of the year, and many guides rate October as the single best month for the trek.
The one window to avoid is the June to August monsoon, when rain dominates the lower valleys, the high views vanish behind cloud, and the already-unpredictable Lukla flights get worse.
Cost expectations
A guided 12-day Base Camp trek typically runs somewhere in the low thousands of US dollars per person, depending on group size and how much comfort you build in, plus your flights to Kathmandu and the Lukla flight. Independent trekking is cheaper but you give up the logistical and safety margin a good guide provides at altitude, which is not where I would economize.
Day-by-day plan
| Day | What you're doing | Health note |
|---|---|---|
| 1 | Fly Kathmandu to Lukla, trek to Phakding Scenic mountain flight to Lukla (2,860 m), then a gentle downhill walk to Phakding (2,610 m) along the Dudh Koshi. | An easy first day on purpose. Hydrate hard and keep the pace conversational. The slight drop in sleeping altitude is your friend. |
| 2 | Phakding to Namche Bazaar Cross suspension bridges and climb steeply through pine forest to Namche Bazaar (3,440 m), the Sherpa capital of the Khumbu. | Today gains roughly 830 m. It is the first real altitude test. Slow your breathing, take the climb to Namche in low gear. |
| 3 | Namche Bazaar acclimatization day A rest day that is not a rest. Day-hike up toward the Everest View Hotel and Khumjung (around 3,880 m), then return to sleep low in Namche. | Classic climb-high-sleep-low. Ascending about 440 m and sleeping back at 3,440 m trains your body without overloading it. |
| 4 | Namche to Tengboche Contour the valley with first big views of Everest, Lhotse, and Ama Dablam, descend to the river, then climb to Tengboche monastery (3,860 m). | A net gain of about 420 m to sleep. Moderate and well-spaced. Watch for early headache or poor sleep as your first AMS signals. |
| 5 | Tengboche to Dingboche Through Pangboche and into the broad Imja Valley above the treeline to Dingboche (4,410 m). | You are now above 4,000 m and gaining roughly 550 m. Appetite and sleep often dip here. That is expected, not a reason to push faster. |
| 6 | Dingboche acclimatization day Second built-in acclimatization day. Hike Nangkartshang ridge toward 5,000 m for the views, then drop back to sleep in Dingboche. | The single most protective day on the route. Climbing high and returning to a 4,410 m bed is what lets you tolerate the final push. |
| 7 | Dingboche to Lobuche Past the Thukla memorials to fallen climbers and along the Khumbu Glacier moraine to Lobuche (4,910 m). | Thin, cold air and a sobering stretch. Keep gains modest and tell your guide immediately about any worsening headache, nausea, or unsteadiness. |
| 8 | Lobuche to Gorak Shep, then Everest Base Camp Trek to Gorak Shep (5,140 m), drop your pack, then walk out to Everest Base Camp (5,364 m / 17,598 ft) and back to Gorak Shep to sleep. | The big day. You touch 5,364 m but sleep lower at Gorak Shep. Any signs of confusion, breathlessness at rest, or a wet cough mean descent, not summit. |
| 9 | Kala Patthar sunrise, descend to Pheriche Pre-dawn climb to Kala Patthar (5,545 m) for the classic Everest panorama, then a long descent to Pheriche (4,370 m). | Highest point of the trip, then down fast. Descending roughly 1,200 m to sleep is the best altitude medicine there is, and most people feel reborn by evening. |
| 10 | Pheriche to Namche Bazaar Retrace the trail back below the treeline to the comforts of Namche Bazaar (3,440 m). | Oxygen-rich air returns. Lingering altitude symptoms should resolve as you descend. If they do not, keep going down and seek care. |
| 11 | Namche to Lukla A final long day down the Dudh Koshi valley back to Lukla (2,860 m). | Knees, not lungs, are the issue now. Trekking poles and a slow downhill cadence protect your joints on the steep descents. |
| 12 | Fly Lukla to Kathmandu Morning mountain flight back to Kathmandu. Build in a buffer day for weather delays, which are common at Lukla. | Lukla flights are weather-dependent. Never plan an international connection for the same day. |
Frequently Asked Questions
Everest Base Camp sits at about 5,364 m (17,598 ft), and the Kala Patthar viewpoint is higher still at roughly 5,545 m. The CDC reports that acute mountain sickness rates can approach 30 to 40 percent on trekking routes where rapid ascent is hard to avoid, and the Everest region is specifically named as one that pushes the limits of many people's ability to acclimatize. A paced itinerary with acclimatization days is the main way to lower that risk.
Many trekkers do, and the CDC's Yellow Book advises a low threshold for preventive medication on Everest routes. The typical adult prophylactic dose is 125 mg twice daily, usually started the day before you begin ascending and continued as you climb. Acetazolamide speeds acclimatization rather than masking symptoms. It is not a substitute for sensible pacing, and you should confirm dosing and suitability with a provider, since it is a sulfonamide and not right for everyone.
Because sleeping altitude, not distance, drives altitude illness. The Wilderness Medical Society and CDC suggest keeping sleeping-altitude gains under about 500 m per night once above 3,000 m and adding an extra acclimatization night for roughly every 1,000 m gained. The rest days at Namche Bazaar and Dingboche are climb-high-sleep-low hikes that let your body adapt. Shorter itineraries that skip them carry meaningfully higher altitude-sickness risk.
Early acute mountain sickness often looks like a headache, nausea, poor sleep, and fatigue out of proportion to the effort. These usually improve with rest and not ascending further. The emergencies are high-altitude cerebral edema (confusion, loss of coordination, severe drowsiness) and high-altitude pulmonary edema (breathlessness at rest, a wet cough, chest tightness). For either, the CDC is clear that immediate descent is the priority. Tell your guide early; do not wait to see if it passes.
Spring (March to May) and autumn (late September to November) offer the clearest skies and most stable weather. October is widely considered the single most reliable month. The June to August monsoon brings rain lower on the trail, leeches, landslide risk, and clouded peaks, so most trekkers avoid it. Winter is clear but bitterly cold, with overnight lows at Base Camp commonly between minus 15 and minus 20 degrees Celsius even in peak season.
Generally no for the high Khumbu itself. Malaria risk in Nepal is limited to the low-elevation Terai, not the trekking altitudes you spend this trip in, so antimalarials are usually unnecessary for a standard Base Camp route. Yellow fever vaccination is only required if you are arriving from a country with risk of transmission. Your routine travel-clinic visit should still cover Hepatitis A and Typhoid, which are the more relevant exposures. Confirm requirements for your specific routing with a provider.
You do not need to be an athlete, but you should be comfortable walking five to eight hours on consecutive days on uneven terrain. Altitude is the limiter, not raw fitness, and very fit people who ascend too fast still get sick. For stomach safety, stick to bottled or reliably treated water, hot cooked food, and hot drinks. Traveler's diarrhea on the trail is miserable and dehydrating, which compounds altitude risk, so build a treatment plan into your kit before you go.
Alec Freling, MD is a board-certified emergency medicine physician and co-founder of Wandr Health with ER experience treating returning travelers.