Which preposition to use with springtime

of Occurrences 17%

It was now about the middle of October, the springtime of snow-flowers.

in Occurrences 11%

Yesterday the bells upon his cart would have sounded sour, but this morning they rattle agreeably, as though a brisker cow than common, springtime in her hoofs, were jangling to her pasture.

for Occurrences 2%

(In The Saturday evening post, Apr. 22-May 27, 1939) (Pub. abroad as Springtime for Uncle.

Which preposition to use with  springtime