The Phuket to Krabi run is the standard southern Thailand ride, and the standard version of it is the wrong one. Taken as a straight transfer it is about 160 km (100 miles) of Highway 4 with lorries. Taken as a three or four day loop — north off the island to Khao Lak, inland through the Phang Nga karst, across to Krabi's coastal lanes and out to Khao Sok — it becomes the best week of riding on the Andaman coast. The dry season runs November to April, the monsoon runs May to October and genuinely changes the roads, and Thai law wants a motorcycle licence plus an International Driving Permit. This guide covers the route, the roads, the seasons and the rental traps, verified August 2026.
What the coast is made of
Three provinces share this stretch. Phuket is Thailand's largest island at 547 km² (211 sq miles) plus 32 smaller islands, and despite the reputation it is also the country's second-smallest province: crowded, hilly, well surfaced, and jammed in the resort strips. Phang Nga is the mainland province to the north, mostly forest and mangrove, with the bay in between. Krabi to the east is limestone country, with 154 islands, free-standing tower karst inland and on the coast, and Khao Phanom Bencha at 1,397 m (4,580 ft) as its high point.
The road that ties it together is Highway 4, the Phetkasem, the trunk route down the whole peninsula. Phuket connects to the mainland by the Thepkasattri Bridge; the original Sarasin Bridge alongside it, 660 m long, was built in 1951 and opened in 1967 and now carries pedestrians only.
Route at a glance
| Direct distance | About 160 km (100 miles) Phuket to Krabi on Highway 4; roughly 3 hours without stops |
| Loop version | Three to four days taking in Khao Lak, Phang Nga town, Krabi's coastal roads and Khao Sok |
| Start and finish | Phuket island to Krabi town or Ao Nang, Krabi Province |
| Key roads | Highway 4 (Phetkasem) as the spine; 4203 and 4034 on the Krabi coast; 4038 inland to Klong Thom; 401 to Khao Sok |
| Khao Lak detour | About 60 km (37 miles) north of Phuket, with roughly 25 km (16 miles) of linked beaches |
| Khao Sok | 165 km (103 miles) north of Ao Nang; 739 km² park including the 165 km² Cheow Lan Lake |
| Season | Dry November to April, driest January and February; monsoon May to October, wettest June to September |
| Bikes | 125cc handles the coastal lanes; 160cc or a 250–400cc manual for the Highway 4 legs |
Open the Phuket to Krabi loop in Google Maps — Khao Lak, Phang Nga town, Ao Luek and Ao Nang, so the whole corridor is on your navigation before you leave the island.
North off the island to Khao Lak
Getting off Phuket is the least pleasant part of the trip, so do it early. Once across the bridge, Highway 4 runs north up the Phang Nga coast toward Khao Lak, about 60 km (37 miles) from Phuket. Khao Lak is not one place but a string of villages behind roughly 25 km (16 miles) of linked Andaman beaches, from Kha Luk in the south past Nang Thong, Bang Niang and Khuk Khak toward Cape Pakarang.
It is also where the 2004 Indian Ocean tsunami hit Thailand hardest, with a final death toll of over 4,000 and local estimates considerably higher. The naval patrol boat carried almost 1.25 km (0.8 miles) inland from Bang Niang Beach still sits where the water left it, preserved as a museum, and an early-warning system was installed along the coast afterwards. Riding through, the thing worth understanding is that the replanted coastal vegetation you pass is deliberate policy rather than landscaping.
Inland through the Phang Nga karst
The best tarmac on the trip is the Highway 4 section that turns inland and runs east toward Phang Nga town. The road cuts between limestone hills with rubber and palm on both sides and delivers a sustained run of open, well-surfaced curves that is a completely different experience from the coastal strips.
Ao Phang Nga National Park, established by royal decree in April 1981, covers around 400 km² (150 sq miles) of the bay and its tower karst islands, and protects one of Thailand's largest and best-preserved mangrove forests. Khao Phing Kan and the needle of Ko Ta Pu, standing about 20 m off the beach, became "James Bond Island" after the 1974 film The Man with the Golden Gun. None of that is reachable on a bike — it is a boat trip from a pier — but the viewpoints above the bay are, and Samet Nangshe north of Phang Nga town is the one people ride for.
From Phang Nga, Highway 4 continues southeast through Ao Luek into Krabi. The Ao Luek caves are worth the detour: Tham Phi Hua To and Tham Chao Le carry prehistoric rock paintings, and the Lang Rong Rien cave nearby yielded 40,000-year-old stone tools and bone in 1986, one of the earliest known human occupations in Southeast Asia.
Krabi's coastal lanes
Krabi is where you park the long-distance riding and do short days. The coastal spine is Highway 4203 from Krabi town out to Ao Nang, and the road that matters is Highway 4034, which continues past Klong Muang and climbs the headland to the Tup Kaek viewpoint — sealed the whole way with two short steep sections, and the standard sunset ride in the province. Inland, short spurs off Highway 4 reach Wat Tham Suea, the Tiger Cave Temple with its long stairway to a summit terrace, and Khao Phanom Bencha National Park north of Krabi town, sealed to the park gate. Highway 4038 runs south to the Klong Thom hot springs and the Emerald Pool.
One clarification that saves a wasted morning: Railay is not a motorcycle destination. The Phra Nang peninsula is cut off from the road network by its own limestone cliffs and is reached only by longtail from Ao Nang or Nopparat Thara. Ride to the pier, park in a secured lot, and take the boat.
Khao Sok, the wet detour
If you have a fourth day and a bigger bike, Khao Sok is the one inland destination worth the Highway 4 mileage — roughly 165 km (103 miles) one way from Ao Nang, best ridden as an overnight rather than a return. The park covers 739 km² (285 sq miles) including the 165 km² (64 sq mile) Cheow Lan Lake behind the Ratchaprapha Dam, and it holds the largest area of old-growth forest in southern Thailand.
Understand what you are riding into, though. Khao Sok's limestone range catches monsoon rain coming off both the Gulf of Thailand and the Andaman Sea, which makes it one of the wettest places in the country at around 3,500 mm (138 inches) a year, and the wet season there runs from late April all the way into December. It is a dry-season destination on two wheels.
Season, and why the monsoon matters here
Dry season, November to April. This is the window. January and February are consistently the driest months, the wind comes from the east so the Andaman coast sits in the lee of the hills, and Khao Lak can go six weeks at a stretch without rain. Temperatures sit around 28–32 °C (82–90 °F) year round.
Monsoon, May to October. The wind reverses and comes off the sea from the west, driving strong winds, big surf and storm conditions onto the exposed coast. For a rider the specific problem is not the volume of rain but the timing: squalls arrive fast, and the first ten minutes are the dangerous ones, when oil and dust lift off hot tarmac before the water washes them away. The Highway 4034 climbs above Klong Muang are a recurring accident spot in exactly those conditions, and afternoon rain builds reliably over Khao Phanom Bencha from late May. Ride mountain and headland sections in the morning, check the radar, and be willing to sit out a squall under a shopfront rather than push through it.
Licences, rentals and traffic culture
Licences. Thai law requires your home-country motorcycle licence plus an International Driving Permit carrying the motorcycle endorsement, obtained before you travel. A car-only IDP counts as no licence. Police checkpoints on Highway 4, Highway 4203 and the roads into Krabi town check documents and helmets, and on-the-spot fines apply for both. Helmets are mandatory for rider and pillion.
Insurance. Every registered rental bike carries compulsory third-party cover, which pays a capped amount toward people you injure and nothing toward you or the machine. The shop's damage waiver covers the bike with an excess you pay first and typically excludes unsealed surfaces, alcohol, unnamed drivers and riders without a valid IDP. Your medical cover is a separate product, and most standard travel policies either exclude motorcycles or cap engine size at 50cc, which excludes every rental in Thailand. Riding without the right documents voids all of it at once, regardless of who caused the crash.
Rentals. Phuket's resort strips have a long-documented problem with inflated damage claims and with shops demanding your original passport as a deposit. A cash deposit and a passport photocopy are the legitimate arrangement; the original passport is not, and handing it over removes your leverage in any dispute. Film a slow walkaround of the bike before the keys change hands, get the rental agreement in print, and check the tax sticker on the fork is current, because riding an unregistered machine voids every layer of cover.
Traffic culture. Thailand drives on the left. On this coast the hazards are dense resort traffic in Patong and Ao Nang, pickups and tour minibuses overtaking hard on Highway 4, sand blown across coastal corners, and unlit scooters at night. Highway 4 traffic moves fast enough that a 125cc scooter sits uncomfortably in its upper rev range; if you are covering the Phang Nga or Khao Sok legs, take the larger machine.
Gear notes for heat, squalls and salt air
Two things about the Andaman coast punish a setup built for temperate touring. The first is water and glare. Tropical squalls arrive with no warning, coastal junctions on Highway 4 are signed in Thai and English but the useful lanes are not, and a phone taped to the bars is exactly the wrong tool in a downpour at 90 km/h. Having the corridor downloaded before you leave the island, on a screen that survives rain and reads in full sun, is what stops a squall from becoming a wrong turn — our offline navigation guide covers what to set up, and a JADO S6 riding system keeps route and cameras on one display while your phone stays dry in a pocket.
The second is heat and tyres. Rental tyres here run hot on 30-degree tarmac all day and are often nearer the wear limit than you would accept at home, hot-road pressure readings drift a long way from the cold figure, and grip in the first minutes of a squall is the specific thing that hurts people on this coast. Our tire pressure guide explains what to set cold and what to expect hot, and a TPMS sensor catches a slow puncture on a long Highway 4 leg before it becomes a slide. Charging on the road is easy in the resort towns and not in Khao Sok, so a bi-directional fast charger is worth carrying for the inland nights.
FAQ
How far is Phuket to Krabi by motorbike?
About 160 km (100 miles) on Highway 4, roughly three hours ridden straight through. Almost everyone who enjoys it takes three or four days instead, adding Khao Lak to the north, the Phang Nga karst inland and Krabi's coastal lanes at the far end.
When is the best time to ride the Andaman coast?
November to April, with January and February the driest. The monsoon runs May to October with the heaviest rain from June to September, and while the roads stay open, squalls make the headland climbs genuinely slippery and the coast gets strong onshore winds.
Can I ride a scooter from Phuket to Krabi?
You can, but a 125cc automatic is working hard at Highway 4 speeds and overtaking lorries on it is unpleasant. A 160cc automatic or a 250–400cc manual is the right tool for the long legs, with the small bike reserved for Krabi's coastal lanes and Phuket island itself.
Do I need an International Driving Permit in Thailand?
Yes, with the motorcycle endorsement, alongside your home licence. Police checkpoints on Highway 4 and around Krabi check for it, a car-only IDP does not count, and riding without one voids both the rental damage waiver and your travel insurance in any accident.
Should I leave my passport as a rental deposit?
No. A cash deposit plus a photocopy of your passport is the standard, legitimate arrangement in Thailand, and reputable shops do not ask for the original. Phuket's resort strips have a documented history of disputed damage charges, and your passport is the leverage you do not want to give away.
