Source identified1
“Besides the autumn poets sing, A few prosaic days A little this side of the snow And that side of the haze.”
Dickinson notices the less celebrated interval between autumn color and winter snow, finding a distinct natural season in days that conventional poetry might overlook.
Source note: “November,” in Poems: Second Series (1891), Project Gutenberg #12242. The passage is tied to the early edited collection and its editorial title.