Blue-Butterfly Day-Robert frost

It is blue-butterfly day here in Spring
and with these sky-flakes down in flurry on flurry
there is more unmixed colour on the wing
Than flowers will show for days unless they hurry

But these are flowers that fly and all but sing
And now from having ridden out desire
They lie closed over in the wind and cling
Where wheels have freshly sliced the April mire