What is the last thing to burn when cremated?

The last thing to burn during cremation is typically the bones, particularly the denser parts like the skull and spine. As the cremation process progresses, organic materials and soft tissues incinerate first, leaving behind the skeletal remains. These bones eventually break down into ash-like particles after being subjected to high temperatures, usually around 1400 to 1800 degrees Fahrenheit. The process can take several hours, with the bones being processed into a finer ash afterward.