Noise-proof properties of green spaces are studied on the streets with heavy road traffic in Saint-Petersburg. Noise reduction is considered depending on the species composition and planning concept of the plantings. It has been shown that planning concepts such as number of rows or widths of tree planting are more important for noise reduction than species composition of trees and shrubs. The double-row planting of deciduous trees with a green band width of more than 18 m and crowns overlapping of neighboring trees by 60–70% has the best noise protection features.