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Arborvitae can block sound, but how much noise they stop depends on several factors.
If you’ve been wondering, “do arborvitae block sound?” the short answer is yes, arborvitae do block sound effectively when planted and maintained correctly.
Thick rows of arborvitae create a natural sound barrier by absorbing, deflecting, and diffusing noise from roads, neighbors, or other sources.
The key is that arborvitae block sound best when they are dense, tall, and positioned close together.
In this post, we’ll break down exactly how arborvitae block sound, what factors affect their performance, and how to maximize their noise-reducing potential.
Let’s dig into whether arborvitae block sound well enough for your yard.
How Arborvitae Block Sound
Arborvitae block sound by using their thick foliage and layered structure to interrupt sound waves.
Sound travels in waves, and when those waves hit a solid barrier like a dense row of arborvitae, they lose energy.
Here’s the science behind how arborvitae block sound:
1. Foliage Absorbs Sound Waves
The needles and branches of arborvitae act like tiny sound absorbers.
When noise hits the leaves, some of the sound energy is converted into small vibrations in the foliage.
This absorption is why arborvitae block sound more effectively than a solid fence in some cases.
Soft, leafy surfaces absorb mid to high-frequency sounds better than hard, reflective surfaces.
2. Dense Growth Deflects Noise
Arborvitae block sound by physically deflecting noise away from your home.
Their thick, evergreen canopy creates a barrier that forces sound waves to bounce off in different directions.
The more layers of branches, the more the sound gets scattered and weakened.
For the best results, arborvitae should be planted in a staggered double row rather than a single straight line.
3. Height Adds Vertical Coverage
Tall arborvitae varieties like ‘Green Giant’ or ‘Emerald Green’ can reach 15 to 30 feet high.
This height means arborvitae block sound coming from both ground level and higher sources like second-story windows.
Noise from a highway or busy street often comes from multiple angles, and taller arborvitae catch more of it.
Factors That Affect How Well Arborvitae Block Sound
Not all arborvitae plantings perform equally when it comes to noise reduction.
Several key factors determine if arborvitae block sound enough to make a difference in your yard.
1. Planting Density Matters
Arborvitae block sound best when planted close together—typically 3 to 4 feet apart for a hedge.
If spacing is too wide, gaps allow sound waves to pass through.
A dense, uniform wall of arborvitae is far more effective at blocking noise than scattered trees.
2. Maturity and Fullness
Young, sparse arborvitae don’t block much sound at all.
It takes several years for arborvitae to fill out and create a thick sound barrier.
Mature arborvitae with wide canopies and dense inner growth block sound much more effectively than immature plants.
3. Type of Arborvitae
Some varieties naturally have denser foliage than others.
For example, ‘Nigra’ arborvitae is known for its exceptionally dense, dark green foliage that helps block sound.
‘Techny’ arborvitae is another excellent choice because it stays full from top to bottom.
4. Maintenance and Pruning
Regular pruning encourages arborvitae to grow thicker and bushier.
If you let them grow wild, they may become leggy with open gaps near the base.
Well-maintained arborvitae block sound better because they maintain a solid wall of foliage all the way down.
How to Plant Arborvitae for Maximum Sound Blocking
If your goal is to reduce noise, you need to plant arborvitae strategically.
Here are the best practices to ensure arborvitae block sound as effectively as possible:
1. Choose the Right Location
Place the arborvitae row as close to the noise source as possible on your property.
This interrupts sound waves before they reach your home or patio.
For best results, plant arborvitae along the property line facing the source of noise.
2. Use a Double Row Staggered Layout
A single row of arborvitae reduces sound by about 5 to 10 decibels.
A double row with staggered plants can reduce noise by 10 to 15 decibels or more.
Staggering ensures that gaps in one row are covered by the foliage of the other row.
3. Combine Arborvitae with Other Barriers
Arborvitae block sound even better when paired with a solid fence or wall.
The fence provides a hard barrier, while the arborvitae absorb and scatter remaining sound.
This combination is often used near highways for maximum noise reduction.
Limitations: When Arborvitae Don’t Block Sound Enough
It’s important to be realistic about what arborvitae can do.
Arborvitae block sound, but they are not a complete replacement for a soundproof wall.
1. Low-Frequency Noise Passes Through
Deep, rumbling noises from trucks, bass speakers, or industrial equipment are harder to block.
Low-frequency sound waves have longer wavelengths that bend around obstacles.
Arborvitae block sound best at mid to high frequencies like voices or traffic noise.
2. Seasonal Gaps in Winter (For Some Varieties)
Most arborvitae are evergreen, but some varieties can thin out slightly in winter.
If the foliage thins, arborvitae block sound less effectively during cold months.
Choose a dense evergreen variety to maintain year-round noise reduction.
So, Do Arborvitae Block Sound?
Yes, arborvitae block sound, and they are one of the best natural solutions for reducing noise in your yard.
When planted densely, maintained properly, and given time to mature, arborvitae block sound enough to lower traffic noise, neighbor chatter, and other common disturbances.
However, for very loud low-frequency noise, you may need to combine arborvitae with a solid barrier.
Overall, if you’re looking for a living, attractive, and environmentally friendly way to quiet your outdoor space, arborvitae block sound wonderfully.