The Loop starts at the Great Brook Farm State Park in Carlisle. Though there can be significant affluence at the farm itself, a well-known destination for families, you will find that most people stay close to the farm buildings, so that the trails themselves never feel crowded.

From the parking lot, walk towards the farm and its nearby pond. Take left at the main trail intersection in front of the rock-lined trail that climbs to the buildings
Turn right after a few yards to follow the “Litchfield Loop” sign; follow the trail through the meadow and into the woods on the other side
At the fork before another meadow (sign for agricultural field) bear left on a narrow trail at the edge of the field
When you have walked around the meadow, stay left at the next trail fork; do not re-enter the woods in front of you; you then walk over a small stream and into another cultivated field
Continue to walk at the edge of the field before reaching North Road (sign for Litchfield Loop); turn right on the trail that continues between the road and the field
When reaching the first farm buildings, turn left and walk a few yards on North road before re-entering the farm grounds at the pond.