The speed of your tree root removal process depends on a few different factors, including the size and type of tree. However, the fastest method of killing tree roots is applying chemical herbicide, which starts working quickly and efficiently. But this removal method has its drawbacks, such as having a negative effect on the surrounding vegetation and landscaping. Other options like rock salt and stump grinding work relatively quickly and cause less damage to your yard.

While the fastest way to kill a tree is to simply cut it down, there are several other methods to choose from. You should hire a professional tree removal service to cut down a tree to ensure your personal and property safety. Some slower but effective options include treating or grinding the tree stump or using a basal bark treatment. 

The fastest ways to remove a tree stump are by grinding it or burning it.

Stump grinding is often the quickest method, with professionals able to chip away a stump and its roots within a single session. You have the option to hire a professional stump removal service or rent a stump grinder to do it yourself. However, it's important to note that these machines can be large, difficult to transport, and dangerous to operate without prior experience. For safety reasons, hiring a local arborist or landscape specialist is often recommended.

Burning is another fast option. Before you begin, check your local burn laws. The process involves drilling holes into the stump, filling them with vegetable oil, and waiting 24 to 48 hours. Afterward, you can add charcoal bricks to the surface and light the fire, which must be attended at all times.

For a more affordable but much slower alternative, you can use potassium nitrate pellets to accelerate the natural decomposition process. This method typically takes four to six months.

It is possible to burn out a tree stump if it is dried out and in an area of your property with a large buffer. Drill holes in the stump and dig around the base so it burns more easily. Then, build a small campfire on top using kindling and firewood. You’ll need enough to keep the fire going for many hours to completely burn out the stump, especially if it’s large. 

Monitor the fire closely to ensure it doesn’t spread, and have a hose on hand if it starts to get out of control. When the fire is out, break apart the burned stump and dig out what’s left of it.  

If this sounds like a good option, learn more about how to burn a tree stump before attempting it, as it does come with risks.