What is the USDA 'Danger Zone' range for bacterial growth?

• A. 20°F to 120°F (−6°C to 49°C)
• B. 32°F to 110°F (0°C to 43°C)
• C. 40°F to 140°F (4°C to 60°C)
• D. 50°F to 150°F (10°C to 66°C)

Answer: (C)

Bacteria multiply most quickly when foods sit in a temperature range that’s warm enough to fuel growth but not hot enough to kill them. The USDA Danger Zone is 40°F to 140°F (4°C to 60°C). In this zone, many foodborne bacteria can reproduce rapidly, sometimes doubling in as little as 20 minutes, which raises the risk of illness if perishable foods are left unrefrigerated or inadequately heated. Below 40°F, cooling slows or stops growth, and above 140°F, heat-drying or cooking kills many bacteria (though some spores may survive and require proper handling). That’s why this range is considered the safe target for avoiding bacterial growth. The other options either include temperatures that aren’t conducive to growth (below 40°F) or extend past the upper limit (above 140°F), so they don’t accurately define the danger zone.