Thuja occidentalis
18-24 inches tall.
This native evergreen is a great choice for privacy or windbreaks.  It grows in a tall, narrow, pyramid shape that remains green year-round.  It grows best when in full sunlight and in soils that are slightly acidic.
Plant a minimum of 3 feet apart to achieve a low-maintenance hedge.
It can provide food (seeds) and shelter for birds and browse for deer, rabbits, and moose.