The Cottage Garden is located in the northeast corner of the property. It surrounds a cottage which was the former residence of the head gardener and now functions as the headquarters of the Friends of Government House Gardens Society. The garden and building are not open to the public, but the front gardens can be viewed from the sidewalk along Rockland Avenue.

In typical cottage fashion this garden has a long season of bloom, starting with early bulbs, hellebores and peonies, followed by azaleas and rhododendrons. It reaches its peak in late summer when it is a beautiful bouquet of hydrangeas, lilies, delphiniums, salvias and galtonias.