Putting your raw denim in the freezer does NOT kill bacteria. It’s a cool theory, but the truth is there’s no way the freezer at your house is capable of reaching the temperature needed to kill bacteria; approximately -80 degrees Fahrenheit. Your jeans might smell slightly fresher right when you take them out the freezer, but as soon as they heat up it’s back to Stinksville again my friend. The moral of this message is that you’re much better off washing your jeans when they start to smell. You won’t ruin the denim, in fact, washing your jeans keeps them nice and healthy.