Life is unpredictable, and household routines can be disrupted without warning. Power outages, severe weather, or forgotten maintenance can interrupt your freezer, causing food to partially or fully thaw before refreezing. This is risky, especially for meat, seafood, and dairy, because bacteria can multiply rapidly at unsafe temperatures.Often, thawed and refrozen food looks normal, making it hard to judge safety by appearance alone. This is where the coin in a cup method proves surprisingly useful. If you’re away from home, a short outage may go unnoticed, but a longer one can thaw and refreeze frozen food. The coin in a cup method offers a simple way to know whether your freezer contents stayed solid.

Popularized online by Sheila Pulanco Russell, it requires only a cup, water, and a coin. Fill a cup with water, freeze it solid, then place a coin on top and return the cup to the freezer. If power goes out long enough for ice to melt, the coin will sink before refreezing. When you return, the coin’s position reveals what happened. On top means food likely stayed frozen; partway down or at the bottom indicates thawing, meaning perishable items may be unsafe and should be discarded.This method removes guesswork, offering a clear visual indicator instead of relying on smell or texture, which can be misleading. While not a substitute for proper food safety practices or temperature monitoring, it’s a practical backup tool. Paired with regular freezer maintenance and safe handling, it gives peace of mind and reduces the risk of foodborne illness during unexpected power interruptions.