On the first day of fall,

starts form the 1st sep and ends on 21st dec.

Explanation:

The fall starts with the beginning of the autumn season and is marked or associated with that of the harvesting season and this season is based on the astronomical aspects of the with the autumn equinox that marks the first day of the fall and is based on the Georgian and the temperature calendars. Also controlled by the light hours of the day in the northern hemisphere. This season is social and it's celebrated with the various festivals and thus referring to the onset of the winter seasons.

On the first day of fall, the leaves began to change and fall.

Every step I take I can hear crunch underneath each step.

The air been cooler.

I shivered and take a sigh.

I looked up and see a beautiful sunset reflecting it's color at the clouds.

Im not sure if this involves a poem. It just seems like it so here.