How long does milk last in the fridge?

Milk shelf life depends on three variables: pasteurization method, whether the carton has been opened, and refrigerator temperature. The "sell-by date" on the carton is conservative — most milk lasts 5-7 days past it if stored properly at 40°F (4°C) or below.

Standard pasteurized milk (HTST — High-Temperature Short-Time):

Unopened: - Best quality: until sell-by date - Safely drinkable: 5-7 days past sell-by (refrigerated below 40°F) - Spoilage signs: off-smell (sour, ammonia-like), curdling, sliminess

Opened: - Best quality: 5-7 days after opening - Safely drinkable: 7-10 days if stored properly - Note: opening introduces bacteria; smell-test after 5 days

UHT / Ultra-pasteurized milk (the "shelf-stable" type):

UHT (Ultra-High Temperature) milk is heated to 280°F (138°C) for 2-4 seconds, killing all bacteria including spores. This gives much longer shelf life.

Unopened UHT: - 30-90 days at room temperature (per FDA / Codex) - Common in European cartons + boxed milk - "Best by" date is conservative; safe well past

Opened UHT: - 7-10 days refrigerated (same as standard once opened) - No advantage over standard pasteurized after opening

Raw milk: - 5-10 days from milking, refrigerated below 40°F - More variable due to live cultures + bacteria - Smell + sour taste indicate spoilage - Not legal for direct sale in many US states + EU jurisdictions - Cheese-making milk for raw aged cheeses (60-day aging requirement under FDA)

By milk type:

Storage temperature science:

Milk lasts longest at 32-40°F (0-4°C). Above 40°F, bacterial growth doubles every ~1°F. At 50°F: - Shelf life cuts in half - Bacterial counts rise dramatically - "Off" taste appears in 2-3 days

Refrigerator door is the warmest spot (45-50°F due to opening). Store milk in the back of the fridge or main shelf, NOT the door.

The sell-by vs use-by distinction:

• Sell-by date: retailer should sell by this date (conservative; not safety-critical)
• Use-by date: quality date set by manufacturer (some safety implication)
• Best by date: quality recommendation; not safety
• Expiration date: for infant formula + medical foods (regulated)

For milk in the US, the date is typically "sell-by" and milk is safe 5-7 days past it.

Spoilage indicators (use these, not the date):

1. Smell: sour, "off," ammonia-like, vinegary → discard
2. Texture: chunky, slimy, lumpy → discard
3. Color: yellow tint (whole milk should be white) → discard
4. Taste: sour, off, "milk-feels-different" → discard
5. Appearance: separated layers in fridge → may be fine if shaken; discard if also smells off

Refrigerator best practices:

• Set fridge to 34-38°F (1-3°C) for best dairy life
• Store milk in main fridge body, NOT door
• Close cartons tightly after use
• Don't return unused milk from glass back to original carton (introduces oral bacteria)
• Pour from carton into glass, don't drink from carton

Buttermilk + cultured products:

Buttermilk and yogurt have live cultures that actively suppress spoilage bacteria. These last: - Buttermilk: 7-14 days past sell-by - Yogurt: 7-14 days past sell-by (look for separation = fine; mold = discard) - Sour cream: 7-14 days past sell-by

Cream products:

• Heavy cream: 7-10 days past sell-by (high fat = more stable)
• Whipped cream (homemade): 24 hours
• Half-and-half: 7-10 days past sell-by
• Light cream: 7-10 days past sell-by

Plant milks (almond/oat/soy):

• Refrigerated section (Silk, Califia): 7-10 days past sell-by
• Shelf-stable UHT (Tetra Pak): 30-90 days unopened, 7-10 days opened
• Often last longer than dairy due to lower protein content for spoilage bacteria

Freezing milk:

Yes, you can freeze milk (whole, 2%, skim, plant milks all freeze): - Freezer life: 3 months quality; 6+ months safety - Texture changes after thaw (separation; shake well) - Best for cooking/baking, less ideal for drinking after thaw - Don't freeze in glass containers (expansion = breakage) - Pour off ~1 inch from carton before freezing (expansion room)

Don't: - Trust sell-by date as absolute (5-7 days past is normal) - Smell-test very small amounts (use 1-2 tablespoons) - Drink milk that smells off "just to check" (taste-testing isn't safer) - Store milk in door (temperature variation reduces life) - Refrigerate cold milk that's been at room temp >2 hours - Re-pour unused milk from glass back to carton

For food safety:

Per USDA + FDA: refrigerated milk below 40°F is safe to drink for 5-7 days after sell-by date, longer if it doesn't show spoilage signs. The 2-hour rule applies: milk left at room temperature for more than 2 hours should be discarded (rapid bacterial growth above 40°F).

Cross-reference: see /pages/how-long-does/eggs-last for related dairy timing + /pages/how-long-does/chicken-fridge for refrigeration limits + /pages/what-temperature-for/cooking-chicken for protein temperatures.

Most published references (USDA FoodKeeper App, FDA Refrigerator + Freezer Storage Chart, StillTasty, International Dairy Foods Association) converge on 5-7 days past sell-by for opened/unopened standard pasteurized milk, 30-90 days for UHT, and refrigerator temperature ≤40°F as the critical safety factor.