This article examines the concept of practical freedom in Kantian philosophy, tracing its transitional trajectory from the realm of transcendental dialectic in the Critique of Pure Reason to moral legislation in the Critique of Practical Reason. The paper argues that Kant rescues the concept of freedom from a theoretical impasse where it appears as a problem of reason that cannot be known, and transforms it into a fact of reason that establishes itself through moral law. In undertaking an analytical reading of the "Canon of Pure Reason", the study explores the epistemological distinction between transcendental freedom as a logical possibility and practical freedom as a form of causality that attains reality in the sensible world through moral action and autonomy.