Prairie dream meaning is explained below using 4 different sources. Each interpretation is shown with its source.

Interpretation 1 — Gustavus Hindman Miller

To dream of a prairie, denotes that you will enjoy ease, and even luxury and unobstructed progress.

An undulating prairie, covered with growing grasses and flowers, signifies joyous happenings.

A barren prairie, represents loss and sadness through the absence of friends.

To be lost on one, is a sign of sadness and ill luck.

Source: Ten Thousand Dream Interpretation Author: Gustavus Hindman Miller

Interpretation 2 — Gillian Holloway

Being on a green prairie in a dream is an augury of general improvement in your condition.
Source: The Complete Dream Book Author: Gillian Holloway

Interpretation 3 — Joan Seaman - Tom Philbin

1. Hopes and dreams, journeys and self-discovery.

2. Luxury, creature comforts.

Source: New American Dream Dictionary Author: Joan Seaman - Tom Philbin

Interpretation 4 — Martha Clarke

It suggests freedom, spaciousness, and joy. (See GRASS, FLOWERS, and HERB) 
Source: The Big Dictionary of Dreams Author: Martha Clarke