Some sand squeaks when grains slide and rub against one another under a foot. The sound is most likely when grains are relatively uniform, rounded and dry enough to move together, but the exact conditions vary by beach and the physics remains an active research topic.
Sand grains can make sound
A foot compresses and shears a layer of grains. Under the right conditions, many grains move together and create vibrations that become audible as a squeak or chirp. Studies of singing and booming sands link the sounds to grain properties and collective motion, but moisture and packing also matter. [1]
Why only certain beaches
The sand must have suitable grain sizes, shapes and sorting, and it often needs to be clean and relatively dry. A beach with mixed grains, shells or a wet surface may be silent. Even nearby patches can sound different after weather or wave conditions change.
A quiet beach does not mean unusual sand
The sound is a physical result of grains interacting, not an animal call or hidden cavity. Researchers distinguish high-pitched squeaks from the deeper booming sounds made by some dunes; these related phenomena do not necessarily share every mechanism.
Can every beach squeak?
No. Only sand with the right combination of grain and surface conditions produces a noticeable squeak.
Sources and evidence
- Elon University — The sounds of sand ↗
Summarizes grain characteristics associated with singing and squeaking sand.
- University of Michigan — Research on musical sands ↗
Reviews research on squeaking and booming sand and the role of grain properties.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; explanation checked against linked institutional and scientific sources.