My milk turns sour days before the date — what am I doing wrong?

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Ultra-Pasteurized vs. Regular Milk

Regular Pasteurized Milk

• Shorter shelf life
• More sensitive to temperature changes

Ultra-Pasteurized (UHT) Milk

• Heated to higher temperatures
• Lasts longer unopened
• Often stays fresh longer after opening

If your milk spoils quickly, switching to ultra-pasteurized milk may help.

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The Type of Milk Also Matters

Different milk types spoil at different rates.

Spoilage Speed (Fastest to Slowest)

1. Raw milk
2. Whole milk
3. Reduced-fat milk
4. Skim milk
5. Ultra-pasteurized milk

Higher fat content can sometimes support faster spoilage under poor storage conditions.

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Your Refrigerator Might Be the Real Problem

If milk consistently spoils early, your fridge may have issues.

Signs of Fridge Problems

• Uneven cooling
• Frost buildup
• Warm spots
• Condensation inside

Older refrigerators may struggle to maintain stable temperatures.

Tip: If multiple foods spoil early—not just milk—it’s time to inspect your fridge.

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How Long Milk Should Last After Opening (Under Ideal Conditions)

• Regular pasteurized milk: 5–7 days
• Ultra-pasteurized milk: 7–10 days
• Lactose-free milk: Often slightly longer

These estimates assume:

• Proper temperature
• Clean handling
• Correct storage location