What it usually means
A valley is the low ground between mountains, often with a river running through it. It can be green and sheltered, or deep and shadowed. Dreams about valleys usually concern two sides of being low: protection and fertility on one hand, difficulty and hardship on the other.
Shelter is the first theme. Valleys protect from wind. A peaceful green valley in a dream often reflects safety, home and a sense of being held.
Low points are the second. People speak of the valleys of life. A dark or deep valley can reflect a hard period — grief, illness, discouragement.
Transition is the third. Valleys lie between peaks. A valley dream can reflect being between achievements, having come down from one height and not yet climbed the next.
Fertility is another meaning. Valleys collect water and soil. A dream valley full of fields and orchards can reflect abundance and growth.
Perspective is a quieter theme. Looking down into a valley from above can reflect seeing a past difficulty from a distance, often with relief.
Echo is a related theme. Valleys return sound. A dream of calling into a valley and hearing your voice come back can reflect a wish to be heard — or a sense that your words are returning to you.
Home is another meaning. Many villages and towns lie in valleys. A dream of looking down at roofs and smoke from chimneys can reflect longing for belonging and shelter.
Rivers are a quieter link. Most valleys are carved by water over ages. A valley dream can carry the sense of slow forces shaping a life.
Worth saying plainly: mountain holidays and hikes often bring valleys into dreams as remembered landscape.
What changes the meaning
A green, sunny valley. Peace; shelter; abundance.
A dark, narrow valley. A difficult passage; fear.
Walking through a valley. Moving through a hard time.
Looking down into a valley. Perspective on a past or coming difficulty.
A river in a valley. Feelings flowing through a quiet period.
A flooded valley. Overwhelming emotion.
A village in a valley. Community; home; belonging.
Being lost in a valley. Uncertainty about the way out.
Climbing out of a valley. Recovery; new effort.
An echo in a valley. Your words or actions coming back to you.
Fog filling a valley. Unclear conditions; waiting.
A valley at dawn. Hope after a low period.
When it keeps coming back
Recurring valley dreams often appear during recovery from loss or illness, when a person is walking through a long, low stretch of life.
They also come in quiet periods after big achievements, when there is a sense of having come down from a height.
People who have moved away from mountain regions often dream of the valleys where they grew up.
If you keep dreaming of a valley, notice whether it feels sheltering or confining. The same landscape can be refuge or trap.
Some people dream of valleys at the end of hard periods, looking back from the hills. The view often brings a sense of how far they have come.
In Jungian terms
Psalm 23 contains one of the most quoted lines ever written: "Yea, though I walk through the valley of the shadow of death, I will fear no evil." The psalm does not promise that the valley will be avoided. It promises company inside it, and a table laid at the end.
Jungian readers see in the line a wise description of dark periods: they are walked through, not around, and what makes them bearable is not escape but presence.
A valley dream may be part of such a walk. The valley is a passage, not a place to stay.