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Choosing Thai Climbing Crags: Krabi Islands, Chiang Mai Limestone and Central Valleys | Thailand Climbing Crags

Oct 21, 20261 min
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TL;DRThailand's crags split three ways: Krabi's islands and mainland are the busiest, Chiang Mai to Chiang Dao hold northern limestone, and the central valleys come with temple and camp rules. December to February is driest in Krabi. Crazy Horse still has no official reopening notice, Lampang sits on military land, and Koh Yao Noi is officially off limits. Pick a region first, then deal with bolts and transport.
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Series: Thailand Climbing Crags (0 / 12)
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Most people who think of Southeast Asian limestone climbing think of Krabi. But Thailand holds more than that — island crags, northern inland walls and central valleys, and every one of them has its own access rule. Krabi means a boat ride. Chiang Mai's main crag was closed and then never formally reopened. Lopburi means walking through a temple that caps the day at 20 climbers. Lampang is on military land and only works with a guide. Nam Pha Pa Yai's best wall is shut.

This series covers one crag area per guide, twelve in all. This overview helps you pick a region — islands, inland or central valleys — and covers when to go, how to get there, and which rules will stop you.

Pick one of three blocks

Thai climbing trips fall into three blocks, each with its own season and its own risks.

RegionMain cragsStyle and gradesBest forThe catch
Krabi islands and mainlandTonsai, Railay East, Railay West and Phra Nang, North Wall, Chong PhliMostly limestone sport, 4a–9a, single pitch up to 5-pitch multipitchAnyone who wants crowds in season, the famous multipitch lines, or a full climbing tripPeak-season crowds; no official list of which bolts have been replaced
Chiang Mai and Chiang DaoCrazy Horse, Chiang DaoInland limestone, 5b–8a+; 289 routes at Crazy Horse, 61 at Chiang DaoAnyone who wants no boat, wants to mix with the local scene, or wants to avoid tour groupsNo official reopening notice for Crazy Horse; Chiang Dao is inside a national park and only "tolerated"
Central and northern valleysLopburi, Nam Pha Pa Yai, Lampang, Koh Tao127 routes 3a–8a at Lopburi, 101 at Nam Pha Pa Yai, 25 at Lampang, 496 granite boulder routes on Koh TaoAnyone driving straight from Bangkok, wanting quiet, or bringing their own crash padsLopburi's temple rules and daily cap, Nam Pha Pa Yai's closed main wall, Lampang's mandatory CMRCA registration

If you only have one region, Krabi is the most efficient: the highest route density, the best range of guidebooks, and the most gear rental and guiding. But three different route counts circulate for Krabi at once — theCrag lists 1,454 routes for the whole Krabi area, Mountain Project lists 381, and local sites say more than 700, from 5a to 8c. These are different logging scopes, not arithmetic errors. Every number in this series carries its source and the date it was checked.

When to go

Thailand's climbing season mostly overlaps the dry season, but the south and the north do not run on the same calendar.

MonthsKrabiChiang Mai and Chiang DaoPlanning note
NovEnd of the wet season; some walls still seepingDry and cool, usually before burning seasonKrabi is open; crowds are thin
DecDry and cool, the best monthDry, but burning season can start earlyKrabi season starts; book lodging and boats
JanDry; the island has been sold out in Jan–FebDry, but air quality starts to sufferBook Krabi rooms early; sensitive travellers should check Chiang Mai air
FebDry and the least rain (52 mm and 9 rain days on average in Krabi)Burning season is usually at its worstBest Krabi window; consider a different region for Chiang Mai
MarGetting hotBurning season peak; Chiang Mai AQI passed 150 on 2026-03-04Skip Chiang Mai
Apr–JunHot, start of the wet seasonHot; the Chiang Dao wildlife sanctuary was closed 2025-03-01 to 2025-05-15 for fire preventionA bad stretch inland and central; Koh Tao and the southern islands still work

Krabi runs 30–33°C by day and around 23°C at night from December to February; Chiang Mai manages 28–33°C by day and 15–16°C at night, so pack a warm layer. Chiang Mai's burning season usually runs January to April and is worst in March — which almost exactly overlaps Krabi's peak. Anyone trying to do both should schedule for November or after April, not January.

Chiang Dao sits inside Pha Daeng National Park (formerly Chiang Dao National Park), which closed for fire prevention from 1 March to 15 May 2025. The 2027 closure list has not been published; it normally appears in January or February of the year itself, and there is no notice about whether the crags fall inside the closure area. Check again before you leave.

Getting there

  • Krabi: fly Taipei to Bangkok (Suvarnabhumi or Don Mueang), then a Thai domestic flight to Krabi airport (KBV), about 1 hour 25 minutes. The airport shuttle to Ao Nang costs around 150 THB, or a taxi to Ao Nam Mao and a 15–20 minute longtail boat for 100–150 THB. Note that the boats only run in daylight, so you want to be on the island before dark; Railay Beach Club recommends reaching Krabi by 17:00.
  • Chiang Mai: there are direct flights from Taipei to Chiang Mai (CNX), but they cost several times a Bangkok connection. The road from Chiang Mai city to Crazy Horse on Highway 107 takes about 45 minutes; CMRCA runs a shuttle that leaves at 08:30 and returns at 16:30, needs at least four people, and costs 495 THB return. The car park is a dirt road, so taxis usually drop you on the main road and you walk 10–15 minutes uphill.
  • Chiang Dao: take Highway 107 north from Chiang Mai and turn onto 1178. Roughly 90–110 km, about 1.5 hours by car. There is no scheduled bus, so in practice you drive or hire a car.
  • Lopburi and Nam Pha Pa Yai: both are out of Bangkok. Lopburi is 160 km north of the capital, 14 km east-northeast of Lopburi town; the Nam Pha Pa Yai camp is roughly 130 km north-northeast of Bangkok, and its own site says you can arrive by bus, minibus, train or your own vehicle. Neither has a shuttle. Without a car you do not get there.
  • Koh Tao: no direct flights. Take a boat from Ko Samui's airport or from Chumphon; backpacker shuttles meet the ferries at the piers.

Sort out entry first

Taiwanese passports have been visa-free for Thailand since 15 September 2026, for stays of up to 30 days. Taiwan's Bureau of Consular Affairs lists the requirements: a passport valid for at least six months, an onward ticket, accommodation bookings, and at least 20,000 THB in cash or equivalent per person — credit cards do not count. You also need to file the free TDAC electronic arrival card online within 72 hours of arriving.

One trap: visa-free entry allows two land crossings per calendar year; air entry is unlimited. Flying into Krabi via Bangkok and back out again uses two air entries and no land quota. But if you plan to walk into Laos overland and back, confirm first whether those two air entries also count — sources disagree on this, so go with official and airline guidance.

Bolts are the core problem of this series

Thai coastal bolts have a long history: stainless expansion bolts with glue fail within two or three years in this climate, and a wholesale switch to titanium began around 2016. But there is no public official list of what has been replaced. The Thaitanium Project that drove the rebolting has taken its site down, the old domain is now a gambling spam page, and the crowdfunding page says only that "around two thirds of routes have been rebolted". Actual rebolting is done by local climbing shops, and the lists live in the two guidebooks and on printed lists in the shops.

theCrag's per-route descriptions are full of "all titanium bolts" notes, but those are observations reported by climbers, not an official list. Where this series describes bolt condition it says "theCrag records this as all titanium" or "theCrag records old expansion bolts, do not climb" — it never claims a wall has been fully rebolted.

The material research is worth knowing: titanium bolts have been in use locally for more than 20 years with very few recorded failures, and the UIAA's ten-year testing in Thailand found 304 stainless "in bad shape", 316 with surface corrosion, and titanium "like new". That does not mean the coastal bolts have all been replaced — it only means titanium is the right material.

A few details to check yourself: even when the bolts are titanium, you have to judge the slings yourself — many routes rely on slings as well as bolts, and theCrag already marks several routes as having old slings that need replacing. Where a page says "Do not climb", that is current status, not stale information.

Choosing a guidebook

Grades and route counts here come mainly from online databases; the guidebook is the authority. Thailand has five printed guides, and they divide up cleanly:

  • The Pocket Guide – Thailand (Sirichai Pongsopon, 10th edition, fully updated January 2026, 238 pages, 1,000 THB): more than 800 routes in Railay and Tonsai plus another 100-plus in Ao Nang, North Wall and Chong Phli. The author is a local climber who does the rebolting himself, and theCrag rates it as the most accurate of the four southern Thai guides. Mail order is possible, +300 THB for Southeast Asia shipping.
  • King Climbers – Rock Climbing Thailand Guide (Somporn Suebhait, 10th edition, 2025, ISBN 979-8306073606): more than 1,000 sport routes across 85 southern Thai areas — broader than The Pocket Guide, adding Phi Phi, Koh Yao Noi and Laoliang — and it introduces central, northern Thailand and Laos. Print on demand via Amazon; the King Climbers shop in Railay and Watts bar in Tonsai have locally printed colour copies.
  • Rock Climbing in Thailand and Laos (Elke Schmitz and Wee Changrua, 9th edition 2018 plus a 2025 update): covers southern, central and northern Thailand, Laos and Perlis in Malaysia, and the book description says it clearly marks each route's bolt condition. The bulk is the 2018 edition, so pair it with online data.
  • A Guide to Rock Climbing in Northern Thailand (CMRCA Press, 3rd edition, 220 pages, 500 THB): more than 150 pitches across 18 northern Thai sectors including Crazy Horse. Buy it at the CMRCA office in Chiang Mai and ask about current access while you are there.
  • Central & Northeast Thailand Rock Climbing Guidebook (Matthieu Le Gall and Pleum Chenaphun, 1st edition 2018, 350-plus routes): Nam Pha Pa Yai, Kanchanaburi, Khon Kaen and the northeast. Lopburi is not in its coverage list — for Lopburi you rely on the online database plus the old TCDA topo sheets.

If you are only going to Krabi, buying the latest The Pocket Guide once you are in Tonsai is the simplest option; to research routes before you fly, order King Climbers from Amazon. Lopburi has no dedicated paper guide at all.

Two rules not to skip

Deep water soloing (DWS) legality is disputed. A September 2026 roundup notes that some climbing schools say it remains prohibited under 2016 marine park rules, while other operators still run trips. theCrag also has a DWS Wall at the bottom of Railay. This series does not recommend it.

Koh Yao Noi is officially off limits to climbers. It has been banned since 2017, though more than 150 routes there are still climbed in practice. The official koyao.com experiences page offers no climbing, and this series does not recommend going.

How to read this series

The limits of this series

  • The author has not visited these crags. The content is assembled from theCrag, Mountain Project, CMRCA's site, local climbing shops and Chinese-language travel sources. Online data has a ceiling: theCrag's own Railay page says the area was still being rebolted when it was written in 2023 and that much of the site is out of date.
  • Route counts, grades and closures change. Every date in the text is the date it was checked; re-check the official pages and the shop lists before you go.
  • Only one crag's status has a first-hand source — the official Koh Yao Noi prohibition. Other closure and access claims come from theCrag warnings or second-hand reports, and the text says so where it matters.
  • Thailand also has Phi Phi, Ko Lao Liang, Muak Lek, Chon Buri, Rayong, Chiang Rai and other crags with theCrag entries. The data is too thin for a full guide, so they are listed as a further pool rather than written up.

References

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