The documented November 2025 Yan Ta Khao dam-breach flood, the 2022-2024 events, which districts carry real exposure, why Trang's flood season peaks later than the rest of Thailand, insurance and a rental due-diligence checklist.
Trang's flood risk is real and recent -- most severely, the 19-25 November 2025 flood that breached a dam abutment above Yan Ta Khao and submerged the district's economic hub under three metres of water. It sits alongside a shorter-cycle Trang River overflow in Ratsada District (November 2023), national-scale flooding that swept through in August-September 2024, and a smaller flash flood as recently as June 2026. Unlike BAANLYY's Trang safety guide, which covers flooding as one of several hazards, this page goes deep on the flood-specific history, which districts carry documented exposure, why the risk peaks in November-January (later than most of Thailand), insurance and a concrete rental or purchase checklist.
The most severe flooding on record for the province. Heavy rain over the Banthat Mountain Range triggered flash floods and landslides that breached a dam abutment above Yan Ta Khao; floodwater from the Phrai Sawan, Ton Te, Nan Sato and Lam Plok waterfalls converged through Khlong Lam Chan and Khlong Palian near Tham Surin and burst the canal banks. Yan Ta Khao Municipality -- the district's economic hub -- was inundated to over three metres in places, cutting the Trang-Palian road at the Yan Ta Khao fresh market; Palian district saw landslides at four separate locations. Across the province, nine districts and 12,647 households were affected, two people died, more than 13,000 rai of farmland was damaged, and 16 shelters housed 1,118 evacuees.
The Trang River overflowed its banks after heavy rain, flooding low-lying Kuan Mao and Khlong Pang subdistricts in Ratsada District and affecting 206 households -- a smaller, more localised event than 2025, but a documented reminder that the river itself (not just the mountain-range flash floods further south) floods on a shorter cycle.
Trang was one of 26 provinces caught up in nationwide flooding described as the severest in nearly a century in some affected areas, driven by remnants of Typhoon Yagi and months of monsoon rain; national damage was estimated around THB 4 billion. BAANLYY has not found Trang-specific household or damage figures isolated from this national event.
The Department of Disaster Prevention and Mitigation's end-of-November report listed Trang among eight affected provinces; the Khao Chong Botanical Garden in Na Yong district recorded 128.2mm of rain during the event.
Regional flood-monitoring reports (AHA Centre) recorded flooding across South Thailand affecting both Surat Thani and Trang. BAANLYY has not verified district-level detail for Trang specifically from this event.
Off-season for Trang's usual Nov-Jan peak, but a reminder that a single intense downpour can still cause damage year-round: heavy rain flooded Bo Win subdistrict in Sikao district, leaving the Trang-Sikao road impassable to small vehicles, while runoff from the Ban Thad (Banthat) mountain range flooded into Na Yong and Muang Trang districts. Trang was again placed under a DDPM flash-flood watch alongside seven other southern provinces for 28 June-3 July 2026.
Trang's flood risk runs through two separate rivers that both trace back to the same highland spine. The Trang River (about 123km long) begins on Khao Luang in the Nakhon Si Thammarat Range and on high ground in Krabi Province before both tributaries converge at the Banthat Range and flow into Trang past the town core and Ratsada District. The Palian River rises directly in the Banthat Range and drains the province's southern districts -- Yan Ta Khao, Palian and the coast -- through canals including Khlong Palian and Khlong Lam Chan.
Trang sits on the Andaman coast, where the wet season stretches roughly April through November (per BAANLYY's Trang weather guide), but the province's worst documented floods -- November 2022, November 2023, November 2024 and the catastrophic November 2025 event -- all land in the November-January window, when the northeast monsoon pushes moisture across the peninsula. That's a later peak than central and northern Thailand, where September-October is typically worst. Renters and buyers who assume flood risk ends when the mainland's general rainy season winds down in November are working from the wrong calendar for southern Thailand specifically.
The June 2026 event -- flash flooding in Sikao, Na Yong and Muang Trang districts from a single heavy downpour over the Banthat range -- shows the Nov-Jan peak isn't the only risk window. Fast, localised cloudbursts over the mountain catchments can send water downstream with little warning at almost any time of year, even if the odds are lower outside the traditional peak.
The November 2025 event wasn't only a river-level story -- a dam abutment above Yan Ta Khao was breached by floodwater from the Phrai Sawan Waterfall catchment, releasing a surge that joined Khlong Palian and burst its banks. That's a specific, documented infrastructure vulnerability in the Yan Ta Khao area, not just generic heavy-rain flooding.
A general risk pattern based on the documented reach of the 2022-2026 events, not a formal hazard map -- always confirm a specific building's own history directly.
| Area | Exposure | Why |
|---|---|---|
| Yan Ta Khao Municipality (economic hub, Trang-Palian Road/fresh market) | Highest | Documented to over three metres of water in November 2025 after a dam-abutment breach released floodwater through Khlong Lam Chan and Khlong Palian; this is the province's single most severe verified flood zone. |
| Palian district villages near Khlong Palian (Ban Khuan Mai Dam, Ban Mai Han and the wider Ton Te/Nan Sato/Lam Plok waterfall catchment) | Highest | Sits directly downstream of the Banthat Range waterfalls that converge into Khlong Palian; hit by both flash flooding and landslides at four separate locations in November 2025. |
| Ratsada District along the Trang River (Kuan Mao, Khlong Pang subdistricts) | Moderate-to-high | The Trang River's own documented overflow zone -- flooded 206 households here in November 2023, a smaller and more localised event than the Banthat-driven floods further south. |
| Na Yong district and parts of Muang Trang (Trang town core) | Moderate | Affected by Ban Thad (Banthat) mountain-range runoff in the June 2026 event and named in the DDPM's November 2024 provincial flood report; Trang town itself is set back from the worst-hit southern districts but not immune to runoff-driven flooding. |
| Sikao district (Bo Win subdistrict and the Trang-Sikao road corridor) | Moderate, road-focused | The June 2026 event flooded Bo Win subdistrict and cut the Trang-Sikao road to small vehicles; the Sikao coast itself (Pak Meng and the island-ferry piers) is a separate, generally lower-lying-but-different hazard profile from the inland river corridors. |
| Elevated and inland areas away from the Trang/Palian river corridors and the Banthat foothills | Lower | General pattern based on the documented reach of the 2022-2026 events, not a formal hazard map -- always confirm a specific building's own flood history rather than relying on distance alone. |
| Window | Risk | What to expect |
|---|---|---|
| April-August | Low-Moderate | General southwest-monsoon wet season begins per Trang's weather guide; drains and canals usually keep pace, but a single intense downpour over the Banthat catchment -- as in June 2026 -- can still cause localised flash flooding in Sikao, Na Yong or Muang Trang districts. |
| September-October | Moderate | Rainfall builds; Trang can be swept into national-scale flooding events tied to typhoon remnants moving across the region, as happened during the August-September 2024 nationwide floods. |
| November-January | Highest | Trang's documented peak. The northeast monsoon drives the province's most severe verified events -- November 2022, November 2023 (Trang River overflow), November 2024 (DDPM-recorded) and the catastrophic 19-25 November 2025 Yan Ta Khao flood. This is the window to be most weather-aware in, particularly in Yan Ta Khao, Palian and along the Trang River in Ratsada District. |
| February-March | Low | Dry season sets in per Trang's own weather guide; flood risk drops to a minimum, though the Nov-Jan peak means this lower-risk window arrives later here than in much of mainland Thailand. |
As across Thailand, flood damage in Trang is usually included as a standard peril within home and condominium insurance rather than sold separately, regulated by the Office of Insurance Commission (OIC). Entry-level policies with flood cover can start from roughly THB 1,000-1,500 per year, with more comprehensive packages commonly running THB 10,000-15,000 depending on sum insured and provider.
Given the documented Yan Ta Khao and Palian flood history, an insurer may treat those districts differently from Trang town or the Sikao coast. Coverage limits, sub-caps on flood payouts, and whether a rider is required all vary by provider -- confirm the specific terms for your address rather than assuming a blanket policy covers it.
A landlord's building insurance, where one exists, generally covers the structure, not a tenant's belongings. Renters in Yan Ta Khao, Palian, or riverside Ratsada should carry their own contents/renter's insurance with flood cover for furniture, electronics and other personal property, available from the same major Thai insurers regardless of whether the unit is owned or rented.
Trang has had a verified flood event in four of the last five years: November 2022 (South Thailand-wide, per AHA Centre), November 2023 (Trang River overflow in Ratsada District, 206 households), the August-September 2024 national floods, the DDPM-recorded November 2024 event, and the catastrophic 19-25 November 2025 Yan Ta Khao dam-breach flood that affected 12,647 households across nine districts. A further flash flood hit Sikao, Na Yong and Muang Trang districts in June 2026. Severe, damaging floods are not annual everywhere in the province, but the November-January window has produced a documented event in most recent years.
Yan Ta Khao Municipality and the surrounding Palian district villages near Khlong Palian carry the highest documented exposure -- this is where the November 2025 dam-abutment breach sent water to over three metres in places. Ratsada District along the Trang River is a separate, moderate-to-high exposure zone with its own November 2023 overflow history. Na Yong district, Muang Trang (Trang town) and Sikao district's Bo Win subdistrict carry moderate, more localised flash-flood risk, as shown in the June 2026 event.
Trang's worst documented floods -- 2022, 2023, 2024 and 2025 -- all fall in November or later, driven by the northeast monsoon crossing the Andaman peninsula. That's later than the September-October peak typical of central and northern Thailand, so the general assumption that flood risk fades once the mainland rainy season ends in November doesn't hold for Trang specifically.
Yes. Flood cover is typically bundled into standard Thai home and condo insurance policies, regulated by the Office of Insurance Commission, rather than sold as a standalone product. Given Trang's documented flood history in Yan Ta Khao, Palian and Ratsada District specifically, ask any insurer directly whether your district is priced as standard or higher-risk, and renters should carry their own contents insurance since a landlord's building policy typically won't cover personal belongings.
Most of the province -- including Trang town's core, the coast at Pak Meng, and the historic port of Kantang -- carries materially lower documented flood risk than Yan Ta Khao, Palian and the Trang River corridor through Ratsada District. It's a reason to ask a specific building's flood history and elevation before committing in those higher-exposure areas, particularly for a November-January move-in, not a reason to avoid Trang generally.
November 2025 event details (households, deaths, shelters, agricultural damage) are as reported by the Thaiger, citing provincial disaster-relief figures; BAANLYY has not independently verified every figure against a primary DDPM release. Thailand flood-insurance pricing is indicative and varies by insurer and sum insured -- confirm current terms directly with a licensed provider.
Use the checklist above before you commit, then browse Trang residences or talk to BAANLYY about a specific building's flood history.
Flood-risk information is based on documented historical events and official monitoring sources; actual conditions vary year to year -- check for a current DDPM advisory before making a move-in or purchase decision. Hero photo by Shantum Singh on Pexels.