Sill Lane Green is a heavily-wooded, .78 acre greensward at the intersection of Sill Lane and the Boston Post Road where Lyme Street ends and the Boston Post Road begins. To the north of the green is a narrow lane called Griswold Avenue after one of the first settlers of Lyme. On the other side of the green, set back from the road and sheltered from it by large trees, is Peck Tavern, probably constructed in the last half of the 17th century.

Shrubs, shade trees and evergreens are randomly planted throughout. At the center is a circular concrete bench surrounded by shrubs, as is the planter situated at the tip of the green. A franklin Milestone near the Boston Post Road recalls the importance of this route to Colonial America.

The residential properties facing the green along Sill Lane and the Boston Post Road do not greatly impact the green because they are on large lots obscured by trees and foliage. The most notable building (other than the Sill Tavern) is the Ely-Noyes House (1858) west of the green.