Ash

It was only because of a few samaras left attached to this tree that I knew it was an ash. 

Although this is a younger tree, you can see a bit of a diamond pattern forming in the bark, a sign that it is a white ash (Fraxinus americana).

This tree looks lovely from afar. Its young canopy features slightly downward arching branches.

Here's some evidence of the spent flowers and old fruit.

As I zoomed in, I could clearly see an old cluster of ash samaras.

Winter ID can be tough, but leaf scars also give good clues, especially when identifying a particular species within a genus. This leaf scar is another clue that it is white ash (click on the image to zoom in).