Safe Onion Storage for Food Banks: FDA Compliance & Best Practices

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 prevent sprouting, disease development, and quality degradation. Food banks should use calibrated thermometers and humidity monitors (digital or mechanical) to verify storage conditions daily, maintaining documented records for FDA inspections. Avoid cold storage below 45°F, which can trigger dormancy break and sprouting, and prevent temperatures above 55°F, which accelerate decay and fungal growth. Proper ventilation around onions reduces moisture pooling and prevents Fusarium rot, black mold, and bacterial soft rot—all common contaminants in poorly ventilated spaces.

Storage Containers, Labeling, & FIFO Rotation Systems

Use breathable containers (mesh bags, plastic crates with ventilation holes, or wooden bins) rather than airtight sealed boxes, which trap ethylene gas and moisture. Label every container with the receipt date, product source, and expected expiration date—onions typically last 2–3 months under ideal conditions but may deteriorate faster in warmer environments. Implement strict First-In-First-Out (FIFO) rotation by storing newer shipments behind older stock and physically moving older onions to distribution locations first. Train all staff on FIFO compliance and conduct weekly rotation audits to prevent onions from exceeding their 3-month window, which significantly increases mold and sprouting risk.

Common Storage Mistakes & Contamination Prevention

Many food banks fail to separate onions from ethylene-producing produce (apples, bananas, avocados), which accelerates ripening and decay—store onions in isolated sections. Never stack onions higher than 2–3 feet to prevent weight-induced bruising and rot at the bottom; damaged onions harbor pathogens like Listeria and Salmonella, which can contaminate adjacent produce. Inspect incoming onions for visible mold, soft spots, or sprouting—reject any batches showing signs of decay. Document all inspections and rejections in your records; the FDA expects food banks to maintain traceability logs linking storage conditions, rotation dates, and distribution records to prevent recalls and identify contamination sources.

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