Frost wedging is the repeated thawing and freezing of water in cracks rocks. This process can cause significant damage to infrastructure, such as roads and bridges. When water freezes, it expands, and this expansion can cause cracks in rocks to widen. When the water thaws, the cracks contract, and this can further damage the rocks. Over time, this process can cause rocks to break apart completely.

Frost wedging is most common in areas with cold climates, such as the Arctic and Antarctic. However, it can also occur in warmer climates, such as the mountains. Frost wedging is a major factor in the formation of many landforms, such as cliffs, talus slopes, and cirques.