Crandon Park, Key Biscayne

Overview

Crandon Park occupies the northern half of Key Biscayne, a barrier island reached from Miami across the Rickenbacker Causeway. It is a Miami-Dade county park with two miles of beach, backed by palms planted as a coconut plantation before the land became public.

It is a different proposition from the Miami Beach strip across the water. There are no towers on the sand, no clubs and no promenade: this is a park, with picnic areas, a nature centre, tennis courts and long stretches of quiet beach.

The water is unusually calm for an Atlantic-facing beach in Miami-Dade, because a sandbar lies offshore and takes the swell. That is what makes it a family beach, and it is also the key to how it behaves in season.

Our current condition score for this beach is .

Photo summary of last month

Position relative to the Atlantic sargassum belt

Weed leaving the Great Atlantic Sargassum Belt crosses the tropical Atlantic, enters the Caribbean, passes the Yucatán and turns north through the Florida Straits in the Florida Current, which becomes the Gulf Stream. Off Miami-Dade that current runs offshore rather than onto the beach, so sargassum arrives indirectly, pushed inshore by wind and eddies.

Key Biscayne then behaves unlike the mainland beaches a few miles north, and the offshore sandbar is why. It shelters the beach from swell, which is the reason the water is calm, but a beach with no wave energy has nothing to carry material back out. Weed that arrives inside the bar settles and stays.

This is the same mechanism seen at Puerto Morelos and in the Lower Keys: shelter and cleanliness are not the same thing. A calm, shallow, protected beach is pleasant to swim at and slow to clear, and our readings for Crandon reflect that rather than any failure of maintenance.

The island's position south of the main Miami Beach barrier island adds to it, since Government Cut and the Port of Miami channel interrupt the along-shore movement well to the north, leaving this key on its own system.

The sargassum season

On this coast the season runs from roughly May into August, with the heaviest arrivals usually in June and July and little from late autumn through spring. Because a sheltered beach clears slowly, a poor spell here lasts longer than the same weather would produce on an open strand, so the dated record is worth checking close to a visit.

The Florida picture in full, including how the season has changed, is set out in our Florida sargassum season guide.

Swimming conditions and safety

This is among the calmest ocean swimming in Miami-Dade: shallow, gently shelving and largely free of surf thanks to the sandbar, which is why families choose it over South Beach. Lifeguards cover the main sections during posted hours.

The bottom is sand with seagrass in places, so footwear is worth having. Boat traffic works the channels either side of the key, and the causeway waters are busy.

On sargassum: fresh weed in the water is harmless, if unpleasant. The smell comes from material decomposing on hot sand over a day or more and releasing hydrogen sulphide, so a strong odour indicates old weed rather than a new arrival. Weed on the sand can hide small stinging organisms, which is the practical reason to walk around a fresh line rather than through it.

Choosing a hotel on this stretch

Key Biscayne has a small number of resorts and rentals in the village south of the park, and the island is quiet and expensive. Most visitors to Crandon come for the day from Miami or Miami Beach.

The trade against staying on Miami Beach is calm over lively: Key Biscayne is a residential island with a couple of good restaurants and very little nightlife, and the causeway is the only way on and off.

Anyone comparing beaches in Miami-Dade should note that the sheltered ones like this and the open strands at Sunny Isles or South Beach behave differently for structural reasons, so checking both on the same morning is worth the minute it takes.

Access and parking coordinates

Without a car, Miami-Dade bus route 102 runs from Brickell across the causeway to Key Biscayne. Miami International Airport is around 30 minutes by road.

Check live conditions before you go

The sandbar offshore keeps this beach calm and also slows what leaves it, so it can read differently from the open Miami-Dade strands on the same morning. On the live map we track Crandon Park with dated photographs and a current condition score, so you can compare it against South Beach, Haulover and Sunny Isles before deciding where to go.