As a part of setting in lines 1-4, what time of year does the author use to demonstrate the theme in "Nothing Gold Can Stay"?

Spring

In the first few lines of the poem, Frost is describing Spring. He says "her early leaf's a flower". Springtime is seen as a time of new life and beginnings. The flowers are beginning to sprout and bloom after having been dormant all winter long. The poem then continues on through the seasons with the leaves and flowers becoming more prolific. The newness of things is gone and everything becomes more ordinary.