What is the main theme of the poem 'To Autumn'?

"To Autumn" is a poem by English Romantic poet John Keats.

The main themes in "To Autumn" are the power of nature, the passage of time, and the consolation of beauty.

The power of nature: The poem expresses reverence and awe for the great changes wrought by nature as autumn brings its riches to the landscape.
The passage of time: The stages of autumn are illustrates by the poem's three stanzas, from ripening to harvesting to the turn towards winter.
The consolation of beauty: Keats's lines celebrate the great beauty of autumn even as they evoke a somber sensibility.

John Keats, the poet of beauty, was a famous poet of the Romantic period.
His major works are-
- ‘Endymion’
- ‘Hyperion’
- ‘Ode to Autumn’
- ‘Ode to a Nightingale’
- ‘Ode on Melancholy’
- ‘Ode on a Grecian Urn’
- ‘To Lord Byron’
Source: classicalpoets.org