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Khao Sok National Park: Complete 2026 Guide

Last updated 2026-07-07

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TL;DR: Khao Sok National Park charges foreign adults ฿300 (US$9) and children ฿150 (US$4.50) for a 24-hour ticket, with the visitor center open 8am-4:30pm daily year-round. Only the trail’s first stretch to Bang Hua Raet waterfall (about 3km) is self-guided; the longer push to Ton Kloi waterfall (roughly 7-9km) needs a local guide. The rainforest is reckoned at around 160 million years old, older than the Amazon, but wildlife stays elusive in the dense canopy. Rafflesia blooms in an unpredictable window from January into March or April. Dry season (roughly December-April) gives the clearest trails and fewest leeches; wet season (May-November) brings daily rain and leeches for a lusher jungle in return. All prices ฿33 = US$1 (July 2026).

Khao Sok gets called “the oldest rainforest in the world” often enough to sound like marketing copy. It mostly isn’t. This is a genuinely old, dense jungle park in Surat Thani province, between Khao Lak and the interior of southern Thailand. This guide covers the entry fee, hours, which trails need a guide, realistic wildlife odds, the Rafflesia bloom, and the dry/wet season trade-off, all sourced below. Prices in Thai baht with US dollars in parentheses at ฿33 = US$1 (July 2026).

Table of Contents

Quick facts: Khao Sok at a glance

Foreign adult entry฿300 (US$9), valid 24 hours
Foreign child entry (3-14)฿150 (US$4.50)
Opening hours8am-4:30pm daily, year-round
Self-guided trailUp to Bang Hua Raet waterfall, about 3km from headquarters
Guide required beyondTon Kloi (Ton Gloy) waterfall and all longer treks, night safaris, caves
Best seasonDry, roughly December-April
Getting thereKhao Sok village on Highway 401, about 1.5-2 hours from Surat Thani, 2-3 hours from Phuket or Krabi
Cheow Lan LakeSeparate ฿300/฿150 fee zone, about 65-67km east of the park headquarters

Conversions at ฿33 = US$1 (July 2026). Pay entrance fees in cash at the headquarters gate.

How much does it cost to enter Khao Sok National Park?

Foreign adults pay ฿300 (US$9) and children aged 3-14 pay ฿150 (US$4.50) for a ticket valid 24 hours from purchase, according to Thaizer and Wikivoyage. Thai nationals pay a lower local rate. Pay cash at the gate; cards aren’t reliably accepted at the booth.

Cheow Lan Lake, covered below, is its own fee zone with the same ฿300/฿150 structure plus a small pier-cleaning charge, typically around ฿40 (US$1.20) per person, not automatically covered by a headquarters ticket bought on a different day.

What are the park’s opening hours?

The park headquarters and main trailhead operate 8am to 4:30pm daily, all year round, except guided night safaris, allowed after hours with a licensed park guide. If hiking the self-guided stretch to Bang Hua Raet waterfall, plan to be back well before closing, since the trail’s stream crossings get harder to read in low light.

What trails can you hike, and which need a guide?

Only the first stretch of the main jungle trail from headquarters is self-guided: a signed dirt path roughly 3km to Bang Hua Raet waterfall (also spelled Bang Hua Rat), a broad, roughly 10-meter cascade with a shallow, wadeable pool. It suits most fitness levels, crossing a few streams and swimming spots.

Past Bang Hua Raet, the trail continues toward Ton Kloi waterfall (also spelled Ton Gloy), a taller roughly 20-meter drop, 7-9km from headquarters total. This requires a local guide, enforced at a trail checkpoint, hired at headquarters or a village tour desk.

A second, northern route leads to Sip Et Chan waterfall, an eleven-step cascade; other trails and caves (including Nam Talu cave) are guide-required and seasonal, closing in the wet months on flash-flood risk. Budget 2-3 hours for the Bang Hua Raet out-and-back, more for Ton Kloi.

Is Khao Sok’s rainforest really older than the Amazon?

Yes, on the balance of what’s published about it. Khao Sok is widely described, including by the park’s own tourism materials and independent travel and nature sources, as one of the oldest tropical evergreen rainforests on Earth, estimated at around 160 million years, older than the Amazon and Central American rainforests. The claim rests on Thailand’s landmass sitting in roughly the same equatorial position for that entire span, undisturbed by the ice ages that reshaped tropical ecosystems elsewhere, letting the forest develop continuously rather than reset. That’s also why it supports such a dense, layered canopy and unusually high biodiversity for its size.

What wildlife will you actually see?

Manage expectations: Khao Sok’s marketing lists wild Asian elephants, tigers, sun bears, tapirs, marbled cats, and gibbons, and the park genuinely supports that biodiversity. But the dense canopy that makes it special also makes most of that wildlife hard to see. On a standard day hike, expect long-tailed macaques, sometimes silver leaf monkeys, birdlife (hornbills, kingfishers, kites), and maybe a gibbon’s distant call rather than a sighting.

The park’s bird count runs into the hundreds of species, so birdwatchers tend to leave satisfied without a big-mammal encounter. A guided night safari or a trip into the adjoining Klong Saeng Wildlife Sanctuary improves your odds, though neither guarantees the headline species.

When does the Rafflesia flower bloom?

Rafflesia, the world’s largest flower at up to roughly 90cm across, blooms at Khao Sok in a loose window that sources place anywhere from January into March, sometimes into April. There’s no fixed date: Rafflesia has no leaves, stem, or roots of its own, it’s a parasite living inside a specific jungle vine, taking months to a year to bud before blooming for only a few days. A guide who knows a current budding site can take you there, but nobody can promise it’ll still be open when you arrive.

Dry season or wet season: what’s the trade-off?

Dry season, roughly December through April, is the easier window: firmer trails, less leech activity, and routes like Nam Talu cave (closed in wet season for flash-flood risk) open. It overlaps with the Rafflesia’s rough blooming window too.

Wet season, roughly May through November, is a genuine trade-off, not simply worse. Rain arrives as short, heavy downpours rather than continuous drizzle, but trails pick up leeches, close to unavoidable (bring salt or a leech sock), and some routes close on safety grounds. In exchange, the forest is greenest and waterfalls fullest. It’s reliability (dry) versus a lusher jungle you tolerate leeches for (wet).

Where is Khao Sok village and the park headquarters?

Khao Sok village (also called Khlong Sok) sits just outside the park gate, off Highway 401 between Surat Thani and Takua Pa, and is the base for almost every visitor: guesthouses, restaurants, ATMs, a pharmacy, and every tour operator are here. The park headquarters itself sits about 1.5km off the highway.

By road, the village is roughly 1.5-2 hours from Surat Thani and 2-3 hours from Phuket or Krabi, a workable stop between the Andaman coast and the interior. See outthailand.com’s things to do in Khao Lak guide for how a Khao Sok detour fits alongside a Khao Lak beach stay, since the two are commonly combined.

Guided trek or DIY?

DIY works for the self-guided stretch to Bang Hua Raet waterfall and the visitor center’s shorter loops, no advance booking needed.

A guide becomes close to mandatory past that: the longer Ton Kloi trek, any Rafflesia search, night safaris, and most caves all require one, both by park rule and because local guides read terrain and wildlife signs far better than a first-timer. Guided half-day treks (3-4 hours) run around ฿600 (US$18) for one to two people, full-day (about 6 hours) around ฿1,200 (US$36), booked at a village tour desk or headquarters.

Combining Khao Sok with Cheow Lan Lake

Cheow Lan Lake is Khao Sok’s other headline draw, a limestone-karst reservoir about 65-67km east of the park headquarters (roughly an hour’s drive), reached by road then a longtail boat. It’s a separate fee zone from the jungle headquarters area, so a lake trip means a second ฿300/฿150 charge plus the pier-cleaning fee mentioned earlier.

Because the drive, boat transfer, and scenery take a full day on their own, most visitors don’t squeeze the lake into the same day as the jungle trails. An overnight stay in a floating raft house is the more common, satisfying way to do it, catching the karst towers at sunset and sunrise. Package tours combining a lake night with village transport are widely available.

Honest downsides of Khao Sok

  • Wildlife is genuinely elusive. The dense canopy that makes this rainforest special also makes big-name mammals hard to spot. Come for the forest and birdlife, not a guaranteed elephant sighting.
  • Leeches in wet season. May through November, expect them on jungle trails; unpleasant but not dangerous.
  • Humidity is constant, even in dry season, since this is a low-elevation rainforest. Bring more water than you think you’ll need.
  • A guide is often required, not optional, beyond the short self-guided stretch, adding cost and planning.
  • Rafflesia is never guaranteed. Even in-season, its unpredictable bloom means a dedicated trip can come up empty.

FAQ

How much does it cost to enter Khao Sok National Park?

Foreign adults ฿300 (US$9), children ฿150 (US$4.50), valid 24 hours. Cheow Lan Lake is a separate fee zone, not covered by a headquarters ticket.

Can you hike in Khao Sok without a guide?

Only the first roughly 3km, to Bang Hua Raet waterfall. Beyond that, toward Ton Kloi waterfall, a guide is required and enforced at a checkpoint.

Is it true Khao Sok’s rainforest is older than the Amazon?

Yes, on the balance of the evidence: multiple sources put it at around 160 million years old, older than the Amazon, thanks to Thailand’s undisturbed equatorial position through the ice ages.

What animals will you actually see at Khao Sok?

Realistically: macaques, hornbills, maybe a gibbon’s call. Elephants, tigers, bears, and marbled cats are present but very rarely seen outside a night safari or Klong Saeng Wildlife Sanctuary.

When does the Rafflesia flower bloom at Khao Sok?

Roughly January into March, sometimes April, though the window shifts yearly and no bloom is ever guaranteed.

Should I visit Khao Sok in the dry season or wet season?

Dry (roughly December-April) means clearer trails and fewer leeches. Wet (roughly May-November) brings daily downpours and leeches, for a greener, fuller jungle in return.

Should I book a guided trek or explore Khao Sok on my own?

DIY covers the self-guided stretch to Bang Hua Raet waterfall; a guide is required for anything further. Half-day treks run around ฿600 (US$18), full-day around ฿1,200 (US$36).

How do you combine Khao Sok with Cheow Lan Lake?

Base yourself in the village for the jungle, then add a separate trip to the lake, about 65-67km east by road plus a longtail boat, ideally as an overnight raft-house stay.

Planning the rest of your trip

For everything else Khao Sok offers beyond the headquarters trails, see outthailand.com’s things to do in Khao Sok guide, and for the full logistics of a lake stay, the Cheow Lan Lake guide. Routing along the Andaman coast, outthailand.com’s things to do in Khao Lak guide covers the beach town most travelers pair with a Khao Sok detour. Once your park days are set, check outthailand.com’s live events calendar for what’s on elsewhere in Thailand the same week.

Sources

Frequently Asked Questions

How much does it cost to enter Khao Sok National Park?

Foreign adults pay ฿300 (US$9) and children aged 3-14 pay ฿150 (US$4.50) for a ticket valid 24 hours from purchase. Cheow Lan Lake is a separate zone with its own ฿300/฿150 fee plus a small pier-cleaning charge of around ฿40 (US$1.20) per person, so a lake add-on isn't covered by your headquarters ticket.

Can you hike in Khao Sok without a guide?

Only partway. The main trail from headquarters toward Bang Hua Raet (also spelled Bang Hua Rat) waterfall, roughly 3km in, is open to self-guided hiking on a signed dirt path with a couple of stream crossings and swimming spots. Beyond that point, continuing toward Ton Kloi (Ton Gloy) waterfall, another several kilometers further (roughly 7-9km from headquarters in total), requires a local guide, which the park enforces at a checkpoint partway along the trail.

Is it true Khao Sok's rainforest is older than the Amazon?

That's the widely repeated claim, and it holds up under scrutiny: Khao Sok is described by multiple park and travel sources as one of the oldest tropical rainforests on Earth, estimated at around 160 million years old. The reasoning is that Thailand's landmass has sat in roughly the same equatorial band for that entire span without the ice-age disruptions that reshaped the Amazon and Central American forests, letting this ecosystem develop continuously rather than restart.

What animals will you actually see at Khao Sok?

Realistically: long-tailed macaques, maybe silver leaf monkeys, hornbills and other birds, and possibly the distant call of a gibbon rather than a sighting. The park's bigger draws on paper, wild elephants, tigers, bears, tapirs, and marbled cats, are part of a genuine and well-documented population, but the dense multi-layered canopy makes them very hard to spot on a standard day hike. A guided night safari or a trip into the adjoining Klong Saeng Wildlife Sanctuary improves your odds but still isn't a guarantee.

When does the Rafflesia flower bloom at Khao Sok?

Roughly January into March, sometimes stretching into April, though sources vary on the exact window and the flower is unpredictable year to year. Rafflesia has no leaves, stem, or roots of its own; it parasitizes a specific jungle vine and can take months to a year to bud before blooming for just a few days, so even a guide who knows a current bud site can't promise it'll still be open when you arrive.

Should I visit Khao Sok in the dry season or wet season?

Dry season, roughly December through April, is the easier and more reliable visit: clearer trails, the lowest leech activity, and cave routes like Nam Talu open (it closes in the wet season on flash-flood risk). Wet season, roughly May through November, brings daily downpours (usually short, heavy bursts rather than all-day rain), leeches on the jungle trails, and some routes closed, but it's also when the forest is greenest and the waterfalls run fullest, which some visitors prefer.

Should I book a guided trek or explore Khao Sok on my own?

DIY works fine for the self-guided stretch to Bang Hua Raet waterfall and a look around the visitor center. A guide becomes close to mandatory for anything past that, the longer trek to Ton Kloi waterfall, any Rafflesia search, night safaris, and cave hikes, both because the park requires it on those routes and because a local guide reads jungle terrain and wildlife signs far better than a first-time visitor will. Half-day guided treks commonly run around ฿600 (US$18) for one to two people, full-day treks around ฿1,200 (US$36).

How do you combine Khao Sok with Cheow Lan Lake?

Most visitors base themselves in Khao Sok village for the jungle trails, then add a separate trip to Cheow Lan Lake, about 65-67km (roughly an hour's drive) east of the park headquarters, followed by a longtail boat across the lake itself. Because the drive, boat transfer, and karst scenery take real time, an overnight stay in a floating raft house is the more common and satisfying way to do it rather than squeezing the lake into the same day as the jungle trails.

Out Thailand Team

Based in Chiang Mai

The Out Thailand team lives in and around Chiang Mai and writes practical, on-the-ground guides to events, cost of living, and daily life in Thailand.