3 .Move food to another low-temperature storage space. If the trouble is a breakdown of your freezer, your neighbors may have enough space to hold your food.
4. Place blankets, quilts, or some other covering over the freezer for extra insulation. Do not block the air-vent opening.
Foods held above refrigerator temperatures (40°F) for more than two hours may not be safe to eat. Discard these items. You may safely refreeze most foods if they still contain ice crystals, or if they have been kept cold (40°F or less) and have been thawed no more than 24 to 48 hours.
For more information visit: http://extension.udel.edu/factsheet/when-the-power-is-out/