An acrostic poem is one where the first letters of the lines spell out a word or words if you read them vertically.
I found this type of poem difficult to write. I wanted to make it rhyme and found it difficult given the leading letters that I had to work with.
Outside, we notice a chillier day
Change for us is on its way
The days are getting shorter
Our calendar says fourth quarter
But look at the beauty of the leaves
Enjoy the coolness of the eves
Reap your harvest without delay!