Noise-Reducing Earth Berm & Planting for Highway Adjacent Property

For a Minnesota property 60 feet from a highway (shaded site), build the berm as close to the road as possible—proximity maximizes sound reflection. A 6–8 foot high, 15–20 foot wide berm with 3:1 side slopes is a starting point. Combine with a 6-foot solid fence on top for added mass.

Plants alone attenuate ~7 dB per 100 feet—minimal. But they soften the berm visually. In shade, use fleshy-leaved deciduous shrubs: Peking cotoneaster, dogwood, winged euonymus, false spirea, honeysuckle, barberry, ninebark, privet. Few evergreens tolerate deep shade; consult a local nursery for cold-hardy shade evergreens (maybe certain ferns or yews).

Add a fountain for white noise. Accept that night noise persists—berms and plants reduce, not eliminate, highway sound.