Root Cellar - A Great, Self-Reliant Investment (2024)

A root cellar is one of the ultimate tools of self-sufficiency. Once you learn basic gardening tools and start getting good-sized produce, building your own underground storehouse will help you keep that produce fresh for several months.

A cellar that is properly built will enable you to enjoy last fall's harvest of apples in April or May as well as keep your potatoes, carrots and other vegetables fresh during the long winter months.

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How Does it Work?

The cold, moist air a properly built cellar provides helps keeps fruits and vegetables fresh longer, sometimes for months.

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How Much Does it Cost?

That depends on where you live and how much the materials will cost in your area.

For an eight-foot by ten-foot cellar, you will need the services of a backhoe (or a sharp shovel and a strong back), about 550 concrete blocks, gravel, and cement.

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Things to Consider

According to Mike and Nancy Bubel, authors of the excellent book, Root Cellaring, there are five crucial things when building a root cellar, including, but not limited to, temperature, humidity and proper ventilation.

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This book is a must-have if you plan on storing your fresh produce or building a root cellar.

The Right Temperature

To keep your vegetables fresh, you will need a place you can get cold. A root cellar is designed to borrow cold from the ground as well as from the cold night air. You will need a thermometer to keep track of the temperature, as well as an air duct that you can open on cold nights to borrow the cold and close on warmer days. 



To keep your cellar cold, you can also add double doors to form an airlock. This will also help keep your cellar from becoming too cold during severe winter weather. For best storage, your cellar should be between 32 and 40 degrees Fahrenheit.

Proper Humidity

High humidity in your cellar will keep the root crops and leafy vegetables from shriveling. Make sure your cellar has dirt or gravel, rather than a concrete floor to help increase humidity. You can also pack your vegetables in sand or spread damp burlap bags over your produce, as well as set pans of water on the floor to preserve the moisture.



A hygrometer will help you measure the humidity in your cellar. The best humidity is between 90 and 95 percent. 

And while you want your root cellar to be humid, you don't want water to get on your vegetables, or they'll rot.

To cut back on the possibility of condensation, keep your root cellar smooth. Don't put beams on your ceiling because they will trap the warm air and increase the chances of condensation.

Good Ventilation

Ventilation can both bring in the cool night air and remove the warm air along with excess humidity. It also helps remove vegetable odors and the ethylene gas given off by stored fruits. For best circulation, have your cool air intake coming in low to the floor, and your warm air outtake vent up high and on the opposite side of the room. Screen the exterior openings to keep rodents out. 



Make sure your storage shelves in your root cellar don't touch the walls. Having space between your shelves and the wall will allow the cooler air to circulate around your food, keeping it cooler.

A Convenient Spot

If you live in an area where the winters are harsh, you might want to have your cellar under your house so you can get to your vegetables without going outside. Make it fairly easy to get into. Also provide a source of artificial light, such as a light bulb that you can turn off when you're done. Too much light will deteriorate your vegetables and encourage sprouting.

A Root Cellar Needs Good Drainage

If you are building your cellar, the best choice will be a dirt floor with about three inches of gravel. In the center of the floor install a perforated drainage pipe to carry off any excess water.

Shelving

Make your shelves out of nontoxic material, such as wood that has not been treated. Pine boards will work, but be aware they will rot in the high humidity within 5-6 years. Oak or cedar are your best choices for making the shelves.

Storing Your Food

Store your food in either slatted crates or baskets. Crates will make better use of your space.

Related article: How to store your garden produce.

Or Consider a Poor Man's Root Cellar

If you can't afford a full-sized root cellar, you can make a poor man's root cellar using a steel trash can. Drill holes in the bottom of the steel can for drainage. Then dig a hole that is the depth of the can. Place gravel in the bottom of the can. Use it to store root vegetables, such as carrots. Watch the following video for more information.

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Root Cellar - A Great, Self-Reliant Investment (2024)

FAQs

What are the benefits of a root cellar? ›

Before refrigeration, an underground root cellar was an essential way to store carrots, turnips, beets, parsnips, potatoes, and other root vegetables. Today, root cellars have made a comeback to keep food from freezing during the winter and keep food cool during the summer to prevent spoilage.

What makes a good root cellar? ›

Ideally, root cellars should be a chilly 32°F to 40°F, and they should never freeze. Even root cellars that cool only into the 50s protect many vegetables. (In summer, the temperature might reach the 60s in hot areas). Freezing temperatures damage produce, while warm temperatures speed up decay.

Where is the best place to put a root cellar? ›

First, you'll need to choose a location that provides the ideal conditions for root cellar storage. This location should have a cool, consistent temperature and high humidity. Additionally, it should be well-ventilated to prevent the buildup of ethylene gas, which can cause produce to spoil faster.

How long will potatoes last in a root cellar? ›

With a good in-ground root cellar, potatoes can be stored for 5-8 months. As a sustainable alternative to refrigerated or electrically cooled storage for crops needing cool damp conditions, traditional root cellars are a good option.

Is it worth building a root cellar? ›

Because soil is a poor conductor of heat, the temperature only a couple of feet underneath the ground generally remains cool and constant throughout the year. So, root cellars are great places to store food because of the stable, cool temperatures that essentially act like natural refrigerators.

How much does it cost to install a root cellar? ›

With numerous options available, you can expect to spend an average of $3,000 to $15,000 for an above-ground cellar and $4,000 to $30,000 for an underground root cellar.

How long will vegetables last in a root cellar? ›

Vegetable storage chart
VegetableIdeal temperatureHow long will they keep?
Potato3°C - 5°C (38°F - 40°F) Cool24 - 26 weeks
Brussels sprouts0°C (32°F) Cold but not frozen4 weeks
Cauliflower0°C (32°F) Cold but not frozen3 - 4 weeks
Kohlrabi0°C - 5°C (32°F - 40°F) Cool8 -12 weeks
11 more rows
Apr 6, 2021

Should a root cellar have a concrete floor? ›

And you will probably want a poured concrete floor and footings that go below the frost line. Key considerations for dug-in root cellars are making sure that frozen, wet soil doesn't expand, which would damage the walls.

How deep underground should a root cellar be? ›

Underground root cellars should be at least 10 feet deep with 10 feet of space around the perimeters for most projects. Root cellars in colder climates need to be under the permafrost level or your produce might freeze.

What direction should a root cellar door face? ›

The perfect location for a root cellar is nestled into an existing soil bank in a well-drained location 10 to 20 yards from your house. Ideally, the door should face north to keep out the sun's heat.

Do you need a vent in a root cellar? ›

Ventilation If you do not add ventilation, the temperature in the root cellar would probably be about 60 degrees. This is not cold enough for ideal long-term storage of produce and items will spoil sooner. Thus, we must create an intake that will bring colder air in from the concrete, exterior wall, when fall arrives.

What direction should a root cellar face? ›

Best Location for a Root Cellar

Choose a north or northeast facing hill, mound, or corner of the basem*nt. Soil can be warmed by the sun, so a north facing hillside or corner of the basem*nt will provide the most steady cool temperatures.

Can you store onions and potatoes together in a root cellar? ›

It's also important not to wash potatoes prior to storing them. You can wipe them off with a dry cloth or paper towel. But do wash them prior to cutting, peeling, and cooking them! Never store potatoes with fruit, onions, or garlic.

How long will onions last in a root cellar? ›

This article seems to indicate that in a root cellar environment, one could store onions for 5 to 8 months with proper preparation.

How deep should a root cellar be? ›

Underground root cellars should be at least 10 feet deep with 10 feet of space around the perimeters for most projects. Root cellars in colder climates need to be under the permafrost level or your produce might freeze.

Is a root cellar better than a fridge? ›

While you might not be able to preserve meat, a root cellar or cold room offers a cool enough temperature to preserve most types of produce, cool your wine, and keep fruit fresh and crisp. In cooler zones, you might even be able to keep milk, yogurt, and cheese for several days before they begin to go sour.

Should a root cellar be dry or damp? ›

Finally, for successful root cellar keeping, you need two types of storage to maximize your efforts: damp and dry. Root vegetables require similar conditions to their outdoor growing situation: a dark, moist environment where humidity approaches 100 percent.

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