Swimming with Whale Sharks from Holbox: Season, Rules & Tours

A Holbox whale shark tour is a licensed, full-day boat trip from the island out to open sea, where you snorkel in small groups next to whale sharks feeding at the surface, and it only runs during the summer season, which the Mexican authorities set each year, roughly from mid-May or June to September. Outside those dates no boat may take you to swim with them.

Question	Short answer
Season	Set every year by the authorities; roughly mid-May/June to September
Most reliable months	Usually the middle of the season, June to August
Length of the trip	Most of the day, with a long boat ride each way
Activity	Snorkeling only, in small groups with a guide
Mandatory	Life jacket or flotation, a licensed operator
Not allowed	Touching the sharks, scuba diving, flash, regular sunscreen
Who regulates it	SEMARNAT and CONANP (Mexico’s protected areas commission)

Every summer, plankton blooms off the northern tip of the Yucatán Peninsula, where the Caribbean meets the Gulf of Mexico, and hundreds of whale sharks come to feed on it. It is one of the largest gatherings of the species anywhere. Holbox, in the far north of Quintana Roo, was the first base for these trips, and it is still the closest village to the feeding grounds on many days. Below is how the day works, how the season is decided, the rules you will have to follow and what to check before you book.

How a Holbox whale shark tour works

The whale shark is the largest fish in the sea. Adults commonly measure 5 to 10 metres, and the biggest exceed 12. Despite the name and the size, it is a filter feeder: it swims slowly with its mouth open, sieving plankton and fish eggs, and it is harmless to people. It is also listed as Endangered, which is why every part of the trip is regulated.

The day, step by step

• Early departure. Boats leave the island in the morning, usually from the beach or the small piers in the village.
• The ride out. The captain heads to wherever the sharks were found in recent days. Boat crews share sightings, and the location shifts through the season.
• In the water in turns. When a shark is spotted, the guide gets in with a small group, usually two swimmers at a time, and you snorkel alongside for a few minutes before swapping with the next pair. Everyone gets several turns if the sharks stay.
• The way back. Many tours add a stop to snorkel or swim in calmer water near the coast and a simple lunch or ceviche on board before returning in the afternoon.

How far out are the sharks?

This is the part people underestimate. The sharks feed in open water, often well over an hour from Holbox by fast boat, and in some seasons they gather further east, closer to Isla Mujeres and Cancún. The sea can be choppy, and you may spend more time on the boat than in the water. If you get seasick, take something before you leave, not once you feel ill.

Whale shark season in Holbox

The season is not a fixed date on the calendar. The authorities open and close it each year, and outside it swimming with whale sharks in the area is not permitted. As a guide, it has usually opened between mid-May and June and closed in September.

Why the dates change every year

The sharks follow the plankton, and the plankton depends on water temperature and currents that vary from year to year. The opening date is published shortly before the season starts, so a tour sold months in advance is only a reservation for a date the season is expected to cover. Before you fix your flights around it, check the current year’s announcement with your operator.

The best months within the season

Sightings are usually most reliable in the middle of the season, from June to August. The first and last weeks can be excellent or thin, and the weather matters too: summer is also the start of hurricane season, and when the port authority closes the sea to small boats, tours are cancelled or moved. Plan at least two or three days on Holbox so a lost day can be replaced. Our guide on how to get to Holbox explains the ferry and the drive from Cancún if you are fitting the island into a longer trip.

The rules in the water

Who sets them

The feeding grounds lie inside federal protected areas, including the Yum Balam reserve that covers Holbox. The activity is regulated by SEMARNAT, Mexico’s environment ministry, and the protected areas are managed by CONANP. Only operators with a permit for whale shark tours may take visitors, boats carry a limited number of passengers, and a fee for the protected area applies; ask whether it is included. The details can change from one season to the next, so treat the list below as the general picture and follow your guide’s briefing.

What you will be asked to do

• Wear a life jacket or the flotation the operator gives you. It keeps you at the surface, away from the shark’s path.
• Snorkel only. No scuba diving with whale sharks.
• Small groups. Only a few swimmers, with a guide, are in the water with a shark at the same time.
• Never touch the shark, ride it or block its way. Keep the distance the guide tells you and stay away from the tail.
• No flash photography.
• No regular sunscreen. Wear a rash guard or a shortie wetsuit instead, and keep any lotion to the minimum the operator allows.

Choosing a Holbox whale shark tour

What to check before booking

• The permit. Ask whether the boat is licensed for whale shark tours this season. A cheap offer from an unlicensed boat puts the sharks and you at risk.
• Group size and turns. How many people on the boat, and how they rotate in the water.
• What is included. Snorkel gear, life jacket, wetsuit, lunch, drinking water and the protected-area fee.
• The cancellation policy. What happens if the port is closed or no sharks are found.
• Pickup. Whether the boat leaves from Holbox itself or you are taken to the mainland first.

Who should think twice

You do not need to be a strong swimmer, because the life jacket does the work, but you do need to be comfortable in open water with no bottom in sight and to handle several hours on a moving boat. Small children, people prone to severe seasickness and pregnant travellers should ask the operator directly before booking.

What to bring

• A rash guard or light wetsuit, a hat and sunglasses for the boat.
• Seasickness tablets, taken before departure.
• A dry bag for your phone and a towel.
• Drinking water and a snack if the tour does not include lunch.
• Cash: Holbox has few cash machines and they often run out, so bring what you need from the mainland.

The whale shark day fits well with the rest of the island. Our list of things to do in Holbox covers the lagoon tour, the Punta Mosquito sandbar and bioluminescence, and you can compare areas on the Holbox stays page. Licensed whale shark trips and other boat tours are on our Holbox tours page.

Frequently Asked Questions

When is whale shark season in Holbox?

The authorities set the dates every year. As a rule it opens between mid-May and June and closes in September, with the most reliable sightings from June to August. Check the current year’s dates before you book.

Is swimming with whale sharks safe?

Whale sharks are filter feeders and do not attack people. The main risks are the open sea, the sun and seasickness. Wear the life jacket, follow the guide and keep away from the tail.

Can you scuba dive with whale sharks in Holbox?

No. Encounters are snorkel-only, at the surface, in small groups with a guide.

Can I wear sunscreen on a whale shark tour?

Regular sunscreen is not allowed in the water. Cover up with a rash guard or wetsuit, and ask your operator what, if anything, it permits.