How to Acclimate in Spiti Valley: A Day by Day Guide to Avoiding AMS

Spiti Valley sits between 3,000 and 4,500 metres above sea level depending on where you are on the circuit. That range covers the difference between feeling perfectly fine and feeling like your head is being squeezed by someone who does not particularly like you.

The altitude is not the problem by itself. The problem is the speed at which most people gain it. The Manali route crosses Rohtang La at 3,978 metres and Kunzum La at 4,590 metres in quick succession. The Shimla route climbs gradually over two days through Reckong Peo and Nako before reaching Kaza. Same destination, very different experience for your body.

We always take the Shimla entry on our Spiti group trips. Not because the Manali route is not spectacular, it is, but because the body needs time and the Shimla route gives it that time in a way the Manali route simply does not.

This guide covers how to acclimate in Spiti Valley properly, what the altitude looks like at each stage of the journey, and what to do if things start going wrong.

Why the Shimla Entry Route Works: Altitude Stop by Stop

The Shimla entry to Spiti is the acclimatisation route. The Manali entry is the scenic route. They are not the same thing for your body.

The Manali route crosses Rohtang La at 3,978 metres and Kunzum La at 4,590 metres in quick succession on Day 2 of the circuit. That is a significant physiological demand compressed into a single driving day. The groups we have seen struggle most with AMS have almost always come via Manali entry.

The Shimla route gains altitude gradually over three days. Here is what that looks like stop by stop:

Shimla: 2,206 metres. Baseline. Your body is fine here.

Sangla: 2,621 metres. Entry point, gentle.

Reckong Peo / Kalpa: 2,670 to 2,960 metres. A gentle increase. Most people feel nothing.

Nako: 3,625 metres. First meaningful altitude. Some people notice a mild headache here, which is the body's signal to pay attention, not to push.

Tabo: 3,280 metres. Lower than Nako, which is why we plan a night here before ascending further. Sleeping lower after a day at altitude is one of the oldest principles of high-altitude travel.

Kaza: 3,800 metres. Base camp for the Spiti circuit. Give yourself a full day here before heading higher.

Key Monastery: 4,166 metres. Day trip from Kaza only.

Kibber: 4,205 metres. Best visited and returned from on the same day.

Langza, Hikkim, Komic: 4,300 to 4,587 metres. The highest inhabited villages on the circuit. Go up for the day, sleep back in Kaza.

Kunzum La: 4,590 metres. The pass on the Kaza to Chandratal route. Short stop only.

Chandratal: 4,300 metres. Overnight camping here is one of the best experiences of the whole trip, but only after your body has had sufficient time at Kaza first.

The principle running through all of this is the same: climb high, sleep low. Go up for the day, come back to a lower altitude for the night. Your body recovers during sleep and altitude work at night is physiologically harder than during the day.

The First Two Days Determine the Rest of the Trip

This is the thing most first-timers resist most strongly and regret most clearly.

On Day 1 in Kaza, the temptation is to head straight to Key Monastery, then Kibber, then Komic, all in the same day. You have driven for two days to get here, the landscape is extraordinary, and the energy of arrival pushes people to do everything immediately.

Do not do this.

The first full day in Kaza should include a slow morning, a light walk around the town, a proper meal, and a lot of water. An afternoon visit to Key Monastery at 4,166 metres is fine as long as you return to Kaza for the night. Anything higher than that should wait for Day 2 or Day 3 at the earliest.

By Day 3 in Kaza, if the first two days have been managed well, most people feel noticeably better than they did on arrival. The headache that was present on Day 1 has cleared. The fatigue has lifted. The appetite has returned. The body has started producing the extra red blood cells it needs to function normally at this altitude and the rest of the circuit, Chandratal, the high passes, the long drives, becomes genuinely enjoyable rather than something to endure.

Rush the first two days and you are not just risking AMS. You are risking the entire trip.

What to Eat and Drink in Spiti for Acclimatisation

Water is the most important thing on this list. At altitude, your body loses water faster through respiration alone. Three to four litres per day is the minimum. Add ORS sachets once a day to replace the electrolytes lost.

Garlic soup is the local Himalayan remedy that actually works. The science behind it is debated but the anecdotal evidence from generations of mountain travellers is consistent. Order it at every dhaba that has it. It is warming, hydrating, and the garlic is believed to improve blood flow at altitude.

Thukpa, dal rice, and steamed momos are what the local diet looks like and they are what your body can handle most easily at altitude. Heavy, oily food is harder to digest when your digestive system is already under physiological stress. Eat warm, eat light, eat local. Our vegetarian food guide to Spiti Valley covers the full menu of what to order at each stage of the route.

Avoid alcohol for the first 48 hours minimum. It dehydrates you, disrupts sleep, and reduces your body's ability to respond to low oxygen levels. The first night in Kaza is not the time to celebrate. Day 3 and beyond, with appropriate moderation, is a different story.

Butter tea is the other local staple worth trying beyond the tourist preference for regular chai. The salt and fat content gives it different properties at altitude and the warmth is genuinely useful on cold mornings above 4,000 metres.

Symptoms to Watch For and When to Act

Knowing the difference between normal adjustment and AMS starting to become serious is the most practical skill you can develop before a Spiti trip.

Normal altitude adjustment: Mild headache on arrival that improves with rest and water. Fatigue in the first day or two. Slightly reduced appetite. Sleeping less deeply than usual.

Mild AMS: Persistent headache that does not improve with rest and water alone. Nausea. Dizziness when standing quickly. This is the body telling you to stop ascending and rest.

Moderate AMS: Worsening headache that does not respond to painkillers. Severe fatigue.

Feeling uncoordinated. Persistent nausea or vomiting. This requires descending 300 to 500 metres and monitoring closely.

Severe AMS / HAPE / HACE: Shortness of breath at rest. Confusion or disorientation. Inability to walk in a straight line. Cough with pink or frothy mucus. These are medical emergencies. Descend immediately, as far and as fast as safely possible, and get to a hospital.

The critical rule is simple: if symptoms are getting worse rather than stable or improving after 24 hours of rest at the same altitude, descend. Do not wait to see if it improves.

Medication: What to Carry and How to Use It

Diamox (Acetazolamide) is the standard prophylactic medication for AMS prevention. It works by stimulating faster and deeper breathing, which helps your body acclimatise more quickly. Consult your doctor before the trip for the correct dosage and to confirm it is appropriate for you.

It is not suitable for everyone, particularly those with sulfa drug allergies.

Paracetamol for headaches. Ibuprofen also works but is harder on the stomach at altitude. Both treat the symptom rather than the underlying cause, so if a headache is not resolving with painkillers and rest, take that seriously.

ORS sachets for hydration maintenance. Carry more than you think you need.

Personal prescription medication with extra supply. The nearest pharmacy to most of the Spiti circuit is in Kaza and its stock is limited.

Carry what you need from Delhi or Shimla.

For a full breakdown of what to pack including medication, see our Spiti Valley packing list.

Local Wisdom Worth Listening To

The people who live in Spiti have been at altitude for generations. Their bodies have adapted physiologically in ways that take visitors weeks to achieve. Their practical knowledge about managing altitude is worth more than most medical guides.

Move slowly. Not just in the mountains, but at altitude generally. Walking fast uphill in Kaza is the quickest way to trigger a headache. The local pace is deliberate and it is deliberate for a reason.

Eat what the locals eat. The diet evolved in this environment. Heavy imported snacks and protein supplements do not behave the same way at 3,800 metres as they do at sea level.

Respect the rest day. Locals do not push through bad days at altitude. If someone in your group is feeling rough, the local response is to stop, eat, drink water, and wait. That instinct is correct.

How We Handle Acclimatisation on Our Spiti Group Trips

On every Panny Fack India Spiti expedition, the itinerary is built around acclimatisation rather than speed. The Shimla entry is non-negotiable. The first full day in Kaza is a rest and light exploration day. Village visits above 4,000 metres are day trips, not overnight stays, until the group has had sufficient time at Kaza.

Our trip captains monitor every member of the group for AMS symptoms throughout the circuit. Oxygen is carried in backup vehicles. Emergency descent protocols are briefed before departure.

Browse our Spiti Valley itinerary 9 days to see exactly how we pace the route, or see our Spiti Road Trip and Spiti Bike Trip pages for the full trip details.

Browse all our Road Trips or check our Weekend Trips if you are still deciding on a destination.

WhatsApp us about the Spiti trip

FAQs: How to Acclimate in Spiti Valley

How long does it take to acclimatise in Spiti Valley?

Most healthy travelers feel significantly better after 48 to 72 hours at Kaza altitude. Full acclimatisation to 3,800 metres takes three to five days. For higher altitudes like Komic and Chandratal, additional time at Kaza first is essential.

Is the Shimla route better than Manali for acclimatisation?

Yes, for most travelers. The Shimla route gains altitude gradually over two to three days. The Manali route crosses two high passes in quick succession which is a significant physiological demand. We always take the Shimla entry on our group trips.

What is the oxygen level in Spiti Valley?

At Kaza (3,800 metres), the oxygen level is approximately 63% of what it is at sea level. At Komic (4,587 metres), it drops further to around 57%. These numbers are why rest and hydration matter so much in the first few days.

Can I take Diamox without a prescription in Spiti?

It is available at some pharmacies in Kaza but we strongly recommend getting a prescription from your doctor before leaving Delhi. Stock in Kaza is unreliable and you do not want to be sourcing medication while already symptomatic

What altitude is Kaza in Spiti Valley?

Kaza sits at 3,800 metres (12,467 feet) above sea level. It is the main town of the Spiti Valley and the base for visiting the higher altitude villages on the circuit.

What is the altitude of Spiti Valley overall?

The valley floor sits between 3,000 and 4,000 metres depending on location. The highest inhabited village is Komic at 4,587 metres. Chandratal Lake sits at 4,300 metres. Kunzum La, the high pass on the Kaza to Manali route, reaches 4,590 metres.

Does garlic soup actually help with altitude sickness?

Garlic is believed to improve blood circulation and has been used as an altitude remedy by Himalayan communities for centuries. There is limited clinical evidence but consistent anecdotal evidence from experienced mountain travelers. It is worth ordering at every dhaba that offers it.

Panny Fack India runs Spiti road trips and bike expeditions via the Shimla entry route every season. Acclimatisation is built into every itinerary. See the Spiti Road Trip or WhatsApp us with your dates.