This study seeks to demonstrate that nature provided Frost an objective background against which he could measure the validity of human experience and gain a fuller understanding of it. The experiences examined with reference to the poetry include loneliness, anxiety, sorrow, and hope. Attention is given to the influence of Frost's philosophical skepticism upon his poetry. The study reveals that Frost discovered correspondences between nature and human experience which clarified his perspective of existence. The experiences of loneliness, anxiety, and sorrow were found to relate to Frost's feeling of separation from nature and from the source of existence. The experience of hope was found to relate to Frost's vision of the wholeness and unity of life, a vision which derives from humanity's common source with nature.