What is the overall mood of poem?

The overall mood of the poem "When I Have Fears That I May Cease to Be" by John Keats is one of contemplation and acceptance of mortality. The poet expresses a sense of dread and sorrow at the thought of potentially having no future and ceasing to exist. However, he also finds solace and assurance in the beauty of nature and in the power of human imagination and experience. Throughout the poem, there is a combination of somber reflection and a deep appreciation for the fleeting moments of life.