Koh Tao
Koh Tao is where Thailand learns to dive, in warm shallow water with rare currents, low prices and class sizes capped by law. Blacktip reef sharks a short swim off Shark Bay, and two warships sunk on purpose.
Koh Tao in a nutshell
Koh Tao: what to expect
Every figure here is drawn from 90,000+ stops planned on the island on Stippl.
Koh Tao is where people learn to dive, and the whole island is arranged around that. An Open Water course runs three days, so the rhythm is early boats and early nights and the social life follows it. Around the diving there is sunset on Sairee, the white sandbars of Koh Nang Yuan a few minutes off the north-west coast, blacktip reef sharks at Shark Bay and the scramble up John Suwan for the double-bay view. 29.5% of Thailand trips planned on Stippl include the island.
Koh Tao holds people longer than any other major place in Thailand, and the course is why. Most travellers give it 4 nights on Stippl, where the country as a whole runs to three, and only 12.0% of stops here are a single night. Three of those four days are the certification, which is a commitment you make before you arrive rather than a decision you take on the beach.
Give it four nights if you are diving and three if you are not. A non-diving stay is the east-coast scooter loop with the cliff jump at Tanote Bay, a morning at Koh Nang Yuan before the boats arrive, and the climb to John Suwan in real shoes. Certified divers aim at Chumphon Pinnacle and Sail Rock for the big animals, and at the wrecks if artificial reefs interest you. Come between February and April for the calmest water, and not from late October to December, when the Gulf monsoon peaks.
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Beginner divers
Warm shallow water, rare currents, dense school competition, low prices, and since 2025 legally capped class ratios.
Divers stacking qualifications
Advanced, Rescue, Divemaster, instructor, freediving and conservation courses are all sold here, at every level, which is why people give it 4 nights.
Snorkellers
Reef is reachable from shore at many bays, with blacktip reef sharks at Shark Bay and Sai Daeng and turtles at several sites.
Solo backpackers and party
A hostel and beach-bar scene built for it, concentrated on the one Sairee strip, and materially smaller than Koh Phangan's.
Long-stayers and slow trips
Cheap beds, gyms, yoga, health food and a resident expat dive community make a month easy to lose here.
Land-based active travellers
Granite rock climbing, bay-to-bay hikes, cliff jumping and Muay Thai training fill the days between dives.
Maybe not for you: non-swimmers; anyone who will not ride a scooter and does not want Sairee; travellers on a fixed schedule from late October to December, when the governor can order every boat ashore; and anyone needing step-free access, given the piers, boat-hopping and steep roads.
The best time to visit Koh Tao
Dry and calm
February to April
The driest, calmest window: settled seas, every boat running and the certification courses at full tilt. April and May bring the hottest air.
Monsoon fringe
May to September
Koh Tao sits in the Gulf's rain shadow while the Andaman coast is soaked: short afternoon storms rather than washouts, and the best underwater visibility of the year.
Northeast monsoon
late October to December
The Gulf's real wet season, tailing into January. November averages close to half a metre of rain, the seas run rough, and stay-ashore orders cancel the ferries.
- November is the island's off-switch. The wettest month, the highest cancellation risk and the month the small dive schools historically close; a course booked for November is a course booked for the wrong month.
- January is the month most travellers plan Koh Tao for on Stippl, about 80 days ahead. Only 10.0% of plans are made inside a fortnight, and a three-day course is a commitment made before the boat.
- Visibility peaks from July to September, up to thirty metres, which is not the best weather window. The Gulf monsoon runs opposite to the Andaman's, and this is the single most common Thailand planning mistake.
- The crossing from Samui is the one that gets cancelled. Seventy kilometres of open water; from late October to February give the transfer a spare day either side.
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Things to do in Koh Tao
An Open Water certification
Do the three-day course that most people come for, about €260 to €350 with the accommodation deal, in warm low-current water with a legal cap of four students per instructor. The island's whole rhythm runs on the course timetable.
Blacktip reef sharks at Shark Bay
Swim about 250 metres out from the beach to where the bottom drops to three metres, early morning or late afternoon, and hold still; the sharks are a metre long and uninterested. Free from the beach, or watch from the bar above the bay.
Koh Nang Yuan
Take the five-minute longtail from the north-west coast to the three islets joined by white sandbars and climb to the viewpoint behind Thailand's most photographed island shot. About €7 with the landing fee; go early and leave the plastic bottles on the boat.
John Suwan Viewpoint
Scramble fifteen to twenty minutes at the southern tip for the double-bay view over Chalok and Shark Bay, about €1. Pair it with Freedom Beach below, wear real shoes and be down before dark.
The wrecks and pinnacles
Dive HTMS Sattakut, a warship scuttled in 2011 at thirty metres, and the pinnacles at Chumphon and Sail Rock, where the whale sharks pass in spring. Two fun dives run about €50 with gear.
Cliff jumping at Tanote Bay
Swim to the rock in the bay, climb it on the ropes and jump; there is one way down. The east-coast scooter loop that includes it is the day everyone remembers, and the road needs a proper bike.
The neighbourhoods of Koh Tao
Sairee
Long beach, dive schools, bars
The long west-coast beach and the island's centre: the bulk of the dive schools, essentially all the nightlife and the sunset side. For first visits and anyone doing a course; the beach wins on atmosphere, not looks.
Everything on foot and every evening out, and a beach that is not the island's best.
Mae Haad
Pier, banks, street food
The ferry pier and the practical centre: arrivals, banks, the dive-medicine post, many dive shops and the street-food hub, congested at ferry times. For budget travellers and a first or last night by the boat.
The cheapest food and every departure, and a working port rather than a beach.
Chalok Ban Kao
Quiet village, turtle beach
The south coast's quietest and most local-feeling village, with the third-largest beach, dive centres, a 7-Eleven and a turtle-conservation programme. For quiet stays and divers who do not want Sairee's evenings.
Calm and a village, and a scooter for anything on the other coast.
Tanote Bay
Secluded resorts, steep road
An east-coast resort cluster rather than a village: few restaurants outside the resorts, good shore snorkelling and the cliff-jumping rock, and a notoriously steep access road. For couples who want the sea at the door.
Snorkelling off the sand, and the resort's kitchen for every meal.
Shark Bay
Palm bay, reef sharks
A palm-lined private bay in the south-east with one resort and a beach fee, and the island's signature snorkel with blacktip reef sharks a couple of hundred metres out. For snorkellers and a quiet resort night.
Sharks off the beach, and a fee to reach the sand if you are not staying.
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Where to stay in Koh Tao
Stay in Sairee if you are diving and want company in the evening, or if you have no scooter: the dive schools, the nightlife and the sunset side are all here. Most people give Koh Tao 4 nights on Stippl, the length of an Open Water course. Ask exactly what the course price includes; free nights used to be standard and often no longer are.
Sairee
Dive hostels and party hostels, dorms €10 to €26, with beachfront resorts €50 to €120 on the sand.
Mae Haad
Small hotels and dive-school rooms near the pier, €26 to €60, for a late arrival or early ferry.
Chalok Ban Kao
Hillside social hostels and quiet dive resorts, €12 to €70; hillside rooms trade a view for a steep road.
Tanote Bay
A cluster of resorts with their own restaurants, €40 to €120, and little else within walking distance.
Shark Bay
One resort with bungalows and villas on a private bay, from €100, with a beach fee for outsiders.
What to eat in Koh Tao
pad thai, som tam and curries from carts and family kitchens, 40–60 THB a plate
an unusually large vegetarian/juice/bowl sector for a small Thai island, driven by long-staying divers
early-opening cafés and bakeries; a takeaway sandwich for the boat is a standard order
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Koh Tao customs and what not to do
Reef etiquette is law now
Since April 2025 much of it is statute: stay two metres off coral, no touching or handling marine life, guides included, no fish feeding and no anchoring over reef.
The locals are dive expats
Instructors and long-term expats are the island's de facto community and the service economy is largely foreign-run; the Thai population is small and the temple is theirs.
Much of it is private land
The viewpoints and several beaches sit on it, so the entry fees and buy-a-drink rules follow from that and haggling them is not done; longtail fares to Nang Yuan are fixed.
No plastic on Koh Nang Yuan
Single-use bottles are banned on the island with bag checks on arrival; bring a refillable and a reef-safe sunscreen.
Wat Koh Tao is free
The island's modern temple, built in 2018, is free to enter with shoulders and knees covered, and it is the one place on the island that is entirely Thai.
Do
- Ask a dive school its ratios; one to two for a try dive and one to four for a course are the legal maxima
- Photograph the scooter in detail before riding off, and pay a cash deposit instead of your passport
- Carry small cash for beach and viewpoint entries
- Book courses ahead only in peak season; walk-up placement is otherwise normal
Don't
- Hand your passport over as a rental deposit
- Touch, stand on or chase marine life; it spooks the sharks and, since 2025, breaks the law
- Carry a camera on a training dive unless you hold Advanced Open Water or forty logged dives; it is illegal
- Commit to a dive school via touts on other islands or at the pier; see the schools before you sign
What a Koh Tao trip costs
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Fun facts about Koh Tao
The name Koh Tao means Turtle Island. Green and hawksbill turtles feed and nest around it, and a dive-school programme has raised and released dozens of juveniles since the 2000s.
Two Royal Thai Navy ships were sunk on purpose as dive sites. HTMS Sattakut went down in 2011 and HTMS Suphairin in 2023, a stated policy of drawing divers away from the natural reef.
Koh Tao's reefs are surveyed every week. The Ecological Monitoring Program feeds one of the longest continuous reef datasets anywhere in the Gulf of Thailand.
Koh Tao is not a national park, so it got the heat without the closure. The mass bleaching hit in June 2024, but Koh Tao was not among the twelve marine parks the government closed that year.
Koh Tao measures about 21 square kilometres. You can ride its length in roughly ten minutes, and most of the sights are under an hour apart on foot.
Since April 2025 diving here is governed by national law. Ratios, supervisors and camera rules are set by the Ministry of Natural Resources and Environment, the first time oversight is statutory rather than agency standards.
Local tips for Koh Tao
Three operators serve Mae Haad
Lomprayah's catamarans, Songserm's express boats and Seatran from Samui all land at the one pier, and the through-ticket from Bangkok is Lomprayah's. Check in an hour before and keep to twenty kilos.
Ferry times run long
Every quoted figure is optimistic: Samui is about three hours on the fastest sailing, not two. Tickets are changeable and non-refundable, and a rough-sea warning cancels every boat at once.
The scooter is the accident
Roads are short, very steep and often sand over concrete, and road rash is the badge every visitor sees. Walk between Mae Haad and Sairee; the songthaews wait at the pier for the rest.
How long to stay
Most people give Koh Tao 4 nights on Stippl, longer than any other major Thai place, because the dive course takes three or four days. Book the course, then the room.
Pick the dive school in person
The touts on Samui and Phangan pressure you to commit before you arrive; do not book a school you have not seen. The island has had a recompression chamber since 2023.
Keep your passport
Never leave it as a rental deposit; leave a photocopy and cash. Riding without the motorcycle class on your IDP means the fine is the small part and the insurance will not pay.
Koh Tao questions, answered
Decide first whether you are diving, because a course fixes three days and everything else moves around it. Lay the Gulf islands out in Stippl and read the boat times between them rather than the distances. Then ask people who have taken a course here, in subreddits like r/ThailandTourism or the Facebook groups.
Almost always: 73.6% of the trips that include Koh Tao on Stippl also carry Koh Samui, and most of those pick up Koh Phangan on the way. The three sit within a couple of hours of each other by boat, and the ferry timetables are built around doing exactly that run.
No, though you will be in a minority here. The east-coast scooter loop, the cliff jump at Tanote Bay, a morning on Koh Nang Yuan and the John Suwan scramble fill two or three days on their own, and the snorkelling at Shark Bay puts you over blacktip reef sharks without a tank.
Three days of theory, pool sessions and open-water dives, with a legal cap of four students to one instructor since the national rules changed. The water here is warm and low-current, which is why the island became the place people certify. Book it before the rest of the stop, because the course sets the days rather than fitting around them.
None, so you arrive by boat whatever else you do. Catamarans run from Chumphon in about an hour and a half, from Koh Phangan in around two hours and from Koh Samui in about three. 92.8% of Koh Tao stops planned on Stippl sit in the middle of a route, which is the boats deciding rather than the travellers.
February to April, with June to September as the value window when prices drop and the diving holds up. What to avoid is late October to December, when the Gulf monsoon peaks and boats get cancelled. Travellers leave 80 days between planning a Koh Tao stop on Stippl and arriving, which is time enough to pick the month.
Every guide is written by the Stippl editors and checked against the trips our travellers actually plan. Spotted something out of date? Let us know.
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