Sargassum seaweed has become a topic of concern for Caribbean travelers over the past decade. If you're planning a trip to St Barts, here's what you need to know about this natural phenomenon and how it might affect your beach experience.
Good news for St Barts visitors
Unlike many Caribbean islands, St Barts is less affected by sargassum thanks to its geography and proactive beach management.
What is Sargassum?
Sargassum is a type of brown seaweed that floats on the ocean surface. While it has always existed in the Atlantic, massive blooms have increased since 2011. These floating mats travel with currents and winds, eventually washing up on Caribbean shores.
The seaweed itself isn't dangerous, but when it accumulates on beaches and begins to decompose, it releases hydrogen sulfide gas with an unpleasant smell.
Which St Barts Beaches Are Affected?
Not all beaches experience sargassum equally. The windward beaches facing east tend to receive more seaweed:
Usually sargassum-free beaches
Colombier, Gouverneur, Flamands, and Saline typically remain clear thanks to their protected positions.
When is Sargassum Season?
Peak sargassum season runs from March through August, with the heaviest arrivals typically in May and June. The winter months (December to February) usually see minimal seaweed—another reason to visit during high season.
How St Barts Manages the Issue
The island has invested in regular beach cleaning and monitoring. Most resort beaches are cleared daily. The Collectivity tracks arrivals and coordinates cleanup efforts to maintain the island's pristine reputation.
Check conditions before your beach visit
Get real-time sargassum updates and forecasts for all St Barts beaches.
View sargassum forecast →
