Can You Put Cardboard In The Oven?

This post may contain affiliate links. Please read my disclosure policy.

Putting cardboard in the oven may seem like a convenient way to dispose of boxes and packaging. However, this is generally not recommended. There are a few key reasons why cardboard and ovens don’t mix well.

Cardboard Is a Fire hazard.

One of the biggest dangers of putting cardboard in the oven is that it can easily catch fire. Cardboard is highly flammable, and ovens can reach very high temperatures. Even cardboard that is not directly touching the heating elements can ignite once it gets hot enough.

A small flame on a piece of cardboard can quickly grow into a large fire inside your oven. This can damage the oven itself and potentially spread to other areas of your kitchen. It’s simply not worth the risk of burning your home down just to get rid of some boxes.

Cardboard Can Produce Toxic fumes.

When cardboard burns, it releases toxic smoke and fumes. These fumes contain carbon monoxide, dioxins, and other dangerous chemicals.

Breathing in cardboard fumes can be very hazardous to your health. The smoke released from burning cardboard can irritate your eyes and respiratory tract. Inhaling large quantities of it could potentially cause carbon monoxide poisoning.

Never burn cardboard without proper ventilation, and avoid exposure to the fumes. The toxins released can linger in your home and on surfaces like countertops and walls.

It Can Damage Your oven.

Subjecting your oven to high heat with cardboard inside not only creates a fire risk, but it can also cause damage to the appliance itself.

As cardboard burns and breaks down, it leaves behind ash and residue. This can coat the inside of your oven, creating a mess that is difficult to clean. The ash and smoke residue can get into small holes and gaps.

Over time, this buildup of debris can negatively impact the functioning of your oven. It can affect the heating elements, airflow, and overall efficiency. You may find that your oven no longer cooks food evenly or maintains the proper temperature.

The high heat of the oven can also warp cardboard pieces before they fully burn. This can make removing the damaged cardboard difficult and time-consuming.

It Will Create an Unpleasant smell.

Burning cardboard has a very strong, unpleasant odor. This smell will likely linger in your home for hours, even with the windows open.

The smokey, chemical-like smell can stick to walls, floors, furniture, clothing, and more. Getting rid of this odor once it sets in can be a major hassle.

Rather than stinking up your home, it’s better to find more appropriate ways to dispose of cardboard materials. The short-term convenience isn’t worth the long-term headache.

Grease and Food Can Soak into cardboard.

If you’ve ever had a pizza delivered in a cardboard box, you know grease and oil easily soak into the cardboard. This grease and food debris will be released when the cardboard burns.

As a result, burning cardboard boxes with food leftovers will create even more smoke and odor. It can also increase the risk of grease-related fires spreading out of control.

Only burn clean cardboard, and even then, it carries risks. Avoid burning any boxes or cardboard that may have remnants of food, grease, or other flammable substances.

Alternatives to Burning Cardboard in Your Oven

While putting cardboard boxes in the oven is inadvisable, you do have plenty of safe, eco-friendly options for getting rid of them responsibly. Here are some of the best alternatives:

  • Recycle it: Most types of clean cardboard can be recycled curbside or at local recycling centers. Break down boxes and flatten them for easier pickup or drop-off.
  • Compost it: cardboard boxes can be composted as long as they don’t have a plastic coating or wax layer. Shred or cut into small pieces first.
  • Reuse it: Before discarding, look for ways to reuse cardboard around the house, garage, or garden. Use boxes for makeshift tables, kid’s playhouses, shipping, storing, and more.
  • Trash it. As a last resort, cardboard can go out with your regular household trash pickup. Break it down to minimize bulk.
  • Donate it: Some charities and organizations accept cardboard box donations for reuse. Shelters often need boxes for moving or storing clients items.
  • Sell it: Some recycling centers will pay for clean corrugated cardboard to reuse. This gives it another life rather than disposal.

Frequently Asked Questions About Cardboard in Ovens

Still have some questions about the risks of putting cardboard in an oven? Here are answers to some common queries:

Can you put a cardboard box in the oven?

No, this is not recommended. A cardboard box can easily catch fire and create toxic fumes. The flames can also damage the oven itself. It’s best to recycle or compost cardboard boxes.

What happens if you burn cardboard?

Burning cardboard produces thick black smoke, hazardous fumes containing carbon monoxide and dioxins, and the risk of accidental fires. The oven or the area around it can become contaminated.

Can greasy pizza boxes be burned?

Definitely not. The grease and food debris will create more smoke and odors and increase the chance of uncontrolled, spreading flames. Dispose of oily pizza cardboard through regular trash pickup.

Is it OK to burn cardboard in a fireplace?

It’s inadvisable, even in a fireplace. The risk of accidental flame spread is still present. The smoke released into the home is still very unhealthy. Only burn seasoned firewood.

Can you put cardboard in the microwave?

No, microwaving cardboard is a fire risk and can damage the appliance. It can scorch, ignite, or melt. Never put any paper product, including cardboard, into a microwave.

Why does burning cardboard smell so bad?

The chemicals released from burning cardboard include sulfur compounds, carbon monoxide, and other noxious substances that produce a terrible stench. Wood smoke is naturally less offensive.

Is burning cardboard illegal?

In some areas, yes. Many municipalities prohibit the outdoor burning of trash, including cardboard, due to air pollution and safety concerns. Check your local ordinances.

Can a cardboard fire spread easily?

Yes, cardboard fires in ovens and other contained spaces can ignite surrounding areas by leaping out or producing flying embers. Grease-soaked cardboard burns hotter and faster. Fires can spread surprisingly quickly.

How should I clean my oven after burning cardboard?

Use a commercial oven cleaner and degreaser to safely remove residue and ash. Avoid abrasive scouring pads. Ventilate the kitchen well during and after cleaning.

Wear gloves and read all product instructions carefully before using. The odor may linger for some time.


In summary, cardboard and ovens are a dangerous combination. Consider more eco-friendly and fire-safe disposal methods instead of burning cardboard.

With proper precautions, you can avoid potential fires, damage, toxic fumes, and lingering odors in your home. Be smart, and don’t take risks by using your oven to burn trash.


How useful was this post?

Click on a star to rate it!

Average rating 0 / 5. Vote count: 0

No votes so far! Be the first to rate this post.