What does it mean to dream about avalanche?
An avalanche usually points to a sudden overwhelming force, a buildup that breaks loose all at once and sweeps over everything below.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the falling mass as feeling long held in place that finally gives way, burying the dreamer under its weight. Pressure that accumulates unseen can break like this. What it threatens to cover is worth asking.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung would see contents of the unconscious that have piled up unattended until they collapse downward. It can mark being overwhelmed by what was ignored too long. What is buried may have to be dug out and faced.
Jungian concept (our summary).Modern
Threat-simulation theory reads an avalanche as the mind rehearsing a sudden, burying danger. It often appears when worries have mounted out of sight. The dream lets you meet the collapse without real harm.
Threat-simulation theory (our summary).Mythological
The mountains were the seats of gods, and the burying weight of snow was their wrath made manifest, sweeping travellers from the high passes. Such falls marked the peril of trespassing on sacred heights. The mountain itself seemed to answer.
Rosmerta Publishing editorial synthesis (after Bulfinch; Frazer).