The Clock Starts Thursday: Similan and Surin Reopen 15 October With Clearer Water and a Smarter Ticket

On Thursday, 15 October 2026, the first speedboats of the new season will leave Thap Lamu Pier in Phang Nga and run out over a sea that has spent five whole months without a single tourist wake. Mu Ko Similan and Mu Ko Surin, the two marine national parks that anchor the Andaman coast's dive calendar, reopen that morning for a season that runs all the way to 15 May 2027 [ref:2]. For the boat crews, park rangers and dive guides of Khao Lak and Phuket, it is the happiest Monday-morning feeling of the year — even when it lands on a Thursday.

Why the islands take a five-month nap

The closure is not a mood; it is an order. Thailand's Department of National Parks, Wildlife and Plant Conservation closed both parks to visitors and overnight stays from 15 May to 15 October 2026, a full five months, under a plan announced in May by Surasak Anuson, director of Protected Area Regional Office 5 [ref:1]. His framing was double-edged in the best way: the southwest monsoon makes the crossing rough at this time of year, but the pause is also a recovery window — corals, nesting turtles and fish nurseries get the quiet season all to themselves, while park crews repair piers and facilities ready for reopening [ref:1].

The numbers say the rest is working

The person who gets to count the results is Siriwat Suebsai, chief of Mu Ko Similan National Park. His tally for the last full season: more than 400,000 visitors, over 90 per cent of them international, generating more than 215 million baht in park revenue — up from 197 million the season before [ref:1]. Every one of those baht flows back into conservation work and the coastal economy of Phang Nga and Phuket, which is why park officials describe the strict rules not as limits but as the reason the destination keeps getting better [ref:1].

Your 2026–27 season rulebook

The dates are fixed; the organisation around them is smarter than ever. Here is what changes for this season.

Buy your ticket before the boat. Entry to the Similans is now an electronic ticket bought in advance through the Department of National Parks' e-ticket portal or the QueQ app, with a passport number required for foreign visitors; same-day purchases close at 08:00 [ref:2]. The e-ticket system was piloted across six marine parks, including Ao Phang Nga, Mu Ko Similan and Mu Ko Surin, to make fee collection transparent and keep more of the income flowing to conservation [ref:3].

Know the quota. The park welcomes a maximum of 3,850 visitors a day, a figure that includes 525 slots reserved for scuba divers [ref:2]. That number was not picked from the air: it comes from carrying-capacity research by fisheries scientists at Kasetsart University, commissioned after daily crowds once reached 7,000 [ref:4]. Book early in peak weeks — the quota is counted head by head.

Day trips only. Overnight stays on the islands themselves remain banned, so the season's rhythm is sunrise speedboat out, golden-hour cruise home [ref:2].

Budget the fees. Foreign adults pay 500 baht, children aged 3–14 pay 250 baht; the same rates apply at both Similan and Surin [ref:5]. Divers add a 200-baht-per-day dive fee [ref:5].

What five months of quiet buys you

The Similans are nine granite islands roughly 60–70 kilometres off the Phang Nga coast, all rounded, house-sized boulders on flour-white sand — a completely different silhouette from the limestone karsts most visitors picture when they think of Thai islands [ref:5]. After the closure, early-season visibility regularly exceeds 25 metres, and the first weeks are the calmest, quietest time to meet the reefs: fewer boats, rested corals, and the famous boulder scramble to the Sail Rock viewpoint on island 8 mostly to yourself [ref:5]. Neighbouring Surin adds shallow reef snorkelling and the Moken sea-nomad heritage of the region — two parks, one extraordinary day-trip coastline.

So circle Thursday, 15 October. The sea has kept its side of the bargain for five patient months — clear water, full reefs, turtles back on station. All that's missing is you, an e-ticket, and an early start.