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Bacteria multiply rapidly in the Danger Zone â temperatures between 40 and 140 Â°F (4.4 and 60 Â°C). To keep bacterial levels low, store ground beef at 40 Â°F (4.4 Â°C) or below and use within 2 days, or freeze. To destroy harmful bacteria, cook ground beef to a safe minimum internal temperature of 160 Â°F (71.1 Â°C).hange the water every 30 minutes. Cook immediately. Do not refreeze raw ground meat thawed in cold water or in the microwave oven unless you cook it first. Never leave ground beef or any perishable food out at room temperature for more than 2 hours (1 hour at 90 Â°F and above).
Wash your hands before and after handling the ground beef. After about 10 to 15 minutes of cooking time, check the burger for doneness. Place an instant-read in the center of the thickest burger. According to the USDA, ground meat must be cooked to at least 160Â°, or well done.This typically takes from 10 to 15 minutes, depending on the thickness or size of the hamburgers.fter using the food thermometer, clean it with hot soapy water. Though any temperature under 160Â° is not considered safe for ground meat (USDA Guidelines), here is a list of cooking times for varying degrees of doneness for burgers: 1  Rare: 120 to 125. 2  Medium Rare: 130 to 135. 3  Medium Well: 150 to 155.