onlybeaches

USA · Florida

Best beaches in Marathon

2 ranked beaches in Marathon, Florida

Ranked by the OnlyBeaches Index (OBI) — a 1-10 score blending water purity, conditions, crowd levels and vibe. Updated every 30 minutes.

All beaches in Marathon

  1. 1

    Coco Plum Beach

    One of Marathon’s most meaningful secondary beaches, useful for quieter visits and local discovery.

    7.0
  2. 2

    Sombrero Beach

    Marathon’s signature beach and a major Middle Keys family pick.

    7.0

What makes Marathon's beaches stand out?

Marathon sits in Florida, USA and is home to 2 ranked beaches on OnlyBeaches. Every beach here is scored by the OnlyBeaches Index — a 1-10 metric blending water purity, live conditions (waves, water temperature, wind), crowd intelligence and vibe.

Whether you're after the highest-scoring beach in Marathon or a quieter hidden cove, the list above is refreshed every 30 minutes using live Stormglass and OpenWeather data.