In "The Road Not Taken," what is the season in which the poem is based?
This poem does not directly tell us in which season it is based. Rather, we have to look carefully at the content of the poem to pick up the various clues that there are that suggest a season. If you read the poem carefully, you can infer that the season is probably fall. Note how the wood is described as being "yellow" in the first line of the poem. The road is the second stanza is described as being "grassy," which indicates that we are not in the depths of winter. Lastly, and most tellingly, when the speaker is trying to compare the two roads in the third stanza, he finds little difference between them:
And both that morning equally lay
In leaves no step had trodden black.
The existence of fallen leaves is a very strong indication that the poem is set in fall, as the leaves on the trees were changing colour from their standard green to "yellow" and there are leaves on the ground, covering both paths.