Journal · After dark
Bioluminescence in Holbox
On the right night, every step you take through the water leaves a trail of light behind it.
The glow comes from plankton that light up when the water around them moves. Walk through the shallows and your footsteps bloom. Run your hand through the surface and it trails.
When
Two things have to line up.
The season. It is strongest through the warmer months — roughly May to September, overlapping with whale shark season, which is convenient if you are planning one trip.
The moon. This matters more than people expect. You need darkness, so the nights around the new moon are the ones to aim for. A full moon washes it out completely, no matter how good the season is.
Where
Away from the town lights. Punta Cocos, at the western end of the island, is the usual answer: dark, shallow and quiet. It is a walk or a short cart ride from town.
Go with someone who knows the beach in the dark. It is not dangerous, but the stretch is unlit and finding the right spot in pitch black is not a thing to improvise.
What to expect — honestly
It is faint. Your phone will not capture it, and neither will most cameras. Photographs you have seen of glowing blue waves are, almost without exception, either long exposures or somewhere else entirely.
Let your eyes adjust for a good ten minutes before you decide you cannot see it. Then move your feet.
How to do it
You can walk down yourself on a dark night in season. Or go with a guide, which is what most guests choose: they know which night of the month is worth it and which stretch is glowing this week, and both of those change.
Either way, ask us first. We will tell you honestly whether the nights you are here are the right ones — and if they are not, we would rather say so than sell you a tour.
Ask us which nights of your stay fall near the new moon.