Onion Storage Guide for Bakery Operations

FDA Temperature & Humidity Requirements for Onion Storage

The FDA recommends storing onions at 45–55°F (7–13°C) with 65–70% relative humidity to slow sprouting and decay. Temperatures above 60°F accelerate bacterial and fungal growth, particularly in cut or damaged onions. For raw onions stored in cool rooms or walk-ins, maintain consistent temperature monitoring using calibrated thermometers and log daily readings as required by FSMA compliance records. Never store onions in direct sunlight or near heat sources, as temperature fluctuations create condensation that promotes mold, especially Aspergillus species commonly found on stored produce.

Shelf Life, Container Selection & Proper Labeling

Whole, uncut onions stored at proper temperature maintain quality for 4–6 weeks; cut or pre-diced onions must be used within 24 hours and kept at 41°F or below. Use food-grade, breathable containers (mesh bins or perforated crates) rather than sealed plastic, which traps moisture and accelerates decay. Label all containers with the product name, date received, and expiration date using waterproof markers or printed labels that won't deteriorate in humid storage areas. Discard any onions showing soft spots, mold, or sprouting, as these indicate bacterial or fungal colonization that can cross-contaminate other ingredients.

FIFO Rotation & Common Storage Mistakes to Avoid

Implement strict First-In, First-Out (FIFO) rotation by storing newest shipments behind older stock and checking stored onions weekly for spoilage. Common mistakes include overstocking (creates pressure and bruising that accelerates decay), storing onions with potatoes (potatoes release ethylene gas, which causes rapid sprouting), and neglecting air circulation in storage areas. Document all onion inventory on a purchase and use log—a FSMA requirement for produce safety audits. If you receive onions during a known outbreak listed by the FDA or CDC, trace back the lot number and consider quarantining the product until the alert is cleared.

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