Aerator vs. Dethatcher: Which Is Better for Your Lawn?

Who comes out on top in the battle of the aerator versus dethatcher? Well, each one is a different tool with different uses, so it depends on what your lawn needs. Aerators poke holes in your soil to let nutrients, air, and light in, and dethatchers get rid of the buildup of organic material (leaves, grass, etc.) on top of your soil. Here’s what you need to know about both tools and how they work to get your lawn into the best shape ever.

When to Aerate vs. Dethatch

They’ll both make your lawn look better, but when you aerate versus dethatch varies. While they can be done simultaneously by a professional, you might not necessarily need both. 

If your lawn sees lots of sun or has been the victim of a lot of foot traffic, the soil is likely compacted. When the yard’s soil is tamped down, it’s harder for it to absorb water, receive nutrients, or foster a healthy root system. You may notice water pooling on top of the lawn, as well as thinning or browning patches of grass. These are all signals that your yard could benefit from aeration. 

On the other hand, you’ll want to dethatch your lawn when the layer of thatch is more than 1/2-inch thick. You’ll likely be able to spot thatch with the naked eye and might notice some browning patches or thinning sections of the lawn. 

Process Differences

When someone aerates a lawn, they’re essentially poking holes in the soil using a physical, mechanical, or chemical aerator. You can aerate your lawn by hand using a core aerator or rent a mechanical aerator with a motor for a bigger yard. Chemical aerators are becoming increasingly popular and can be purchased at a garden or hardware store. 

No matter which tool you use, the process is the same. As you move an aerating tool across the grass, it’ll create holes in the dirt. Sometimes, the tool will create plugs of dirt pulled from the soil. These holes help the nutrients and oxygen reach the soil more easily. 

Dethatching a lawn removes the layer of dead grass between new growth and the soil, which naturally builds up over time. Dethatching is essentially raking a lawn and removing that dead layer to allow nutrients to reach the soil better. You can dethatch a lawn using a manual dethatching rake, an electric power rake, or a large vertical mower. When you drag the tools across the yard, they’ll pull up and collect the layer of dead grass or thatch.  

With the layer of thatch removed, a lawn’s soil can receive more light, moisture, and nutrients.

Timing Differences

When it comes to aerating versus dethatching, the time of year and the frequency will vary. The best time to aerate your lawn is in the spring or fall, depending on your grass type. The grass shouldn’t be dormant when you aerate, and while the soil should be moist, you shouldn't aerate right after heavy rainfall.

Most lawns only need to be aerated once annually. But, if your lawn hasn’t been aerated in years and has thick thatch, you might aerate it twice a year—once in the spring and again in the fall—for a year or two.

You can dethatch your lawn any time between the early spring and early fall, based on the type of grass. Cool-season grasses can be aerated in the early spring and fall. Warm-season grasses can be aerated in the late spring or very early summer.

On the flip side, you can dethatch cool-season grasses in the early spring or late summer/early fall. Warm-season grasses can be dethatched from the late spring to early summer. You can safely dethatch your lawn once every one to three years. 

Benefit Differences

Regarding aerating versus dethatching, both will improve your lawn. However, each process has its unique set of benefits.

Benefits of Aeration

Aeration will improve your lawn in several ways, including the following:

• Creating stronger, deeper grass roots

• Breaking up existing thatch

• Loosening compacted soil

• Delivering nutrients and oxygen to the soil

• Encouraging soil drainage

• Making existing grass more resilient

Benefits of Dethatching

Dethatching provides its own sets of benefits to the soil, some of which include the following: 

• Creating better access for water, nutrients, and oxygen to get to the soil and roots

• Producing healthier soil

• Letting more sun on the roots and grass

• Warding off fungus and pests 

• Reducing standing water on lawn

Tool Differences

Aerating and dethatching can be done manually or mechanically, but the tools used are very different. 

Aerating Tools

• A manual aerator resembles a pogo stick. Using the T-shaped handle, you pierce the ground, poking a hole in the earth and pulling up a small dirt core. 

• An alternative to the manual aerator is a spike aerator. This often comes in the form of spikes that you can attach to your shoes to walk around a property and loosen soil.

• A mechanical push-behind aerator is typically gas-powered and can be rented at a garden or home improvement store. It operates like a lawn mower; pushing the tool across the lawn pokes holes in the dirt. 

• A liquid aerator is a relatively new tool with which you can spray a solution on the lawn to make the soil more porous. 

Dethatching Tools

• A manual dethatcher resembles a rake, where you cut into the lawn with the prongs and pull up thatch. 

• A power rake or electric dethatcher resembles a lawn mower and uses small blades to pass across the lawn and remove thatch. 

• A vertical mower uses vertical blades to cut down a yard’s thatch. 

Cost Differences

The cost to professionally aerate your lawn is between $75 and $210, or $140 on average. If you opt to DIY, you can rent aeration tools for about $100 a day. Asking a pro to dethatch your lawn with a vertical mower costs around $175 an hour. Renting a dethatching machine will cost between $40 and $90 a day.