Whose woods these are I think I know.

His house is in the village though;

He will not see me stopping here

To watch his woods fill up with snow.

I noticed that:

He is worried or would be worried if he thought somebody who owned the woods were to see him stopping.

It is evidently snowing at the moment he is describing.

He is not sure if he knows who the woods belong to or not.

The first line is unnatural (poetic?) should be "I think I know whose woods these are."