Charcoal and Ash Trash Never put hot charcoals or ash in your trash container. Watch, How to Safely Dispose of Hot Charcoals for tips! Hot Coals Are a Fire Hazard Allow coals and ash to cool for 48 hours, or pour water onto them and stir carefully to speed up the process. Wait until they are no longer smoldering before attempting to dispose of them. Dispose of Ash Carefully Once ashes have fully cooled, wrap them in aluminum foil or place them in a small metal container, such as a coffee can, and dispose of them in an outdoor trash. Do not place them near anything that could catch fire. Throw the Bag Away Most charcoal bags are paper lined with plastic. Recycling facilities cannot separate the two materials, so bags must be disposed of in the garbage. Ways to Reduce Grill With Propane Instead Propane grills are a more eco-friendly option than charcoal grills. Ways to Reuse Repurpose Unused Charcoal Around the House If your unused charcoal is additive-free, use it to neutralize odors, prevent metal from rusting, or balance nutrients in potted plants, garden beds and compost piles. For more inspiration, check out these ideas from This Old House.