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How long does it take milk to spoil? I left a gallon of milk in the trunk of my car for about 15 hours. I forgot about it when I got home from shopping, I didn't remember until I woke up the next morning. It is October so the weather is not warm,I would say it was under 60 degrees all night. Is this milk still good? Or should I throw it out?

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It is certainly not safe, having been left at unsafe temperatures (above 40 F) for more than a couple of hours. –  SAJ14SAJ Oct 10 '13 at 14:22
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marked as duplicate by SAJ14SAJ, rumtscho Oct 10 '13 at 21:10

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Yes. Milk spoils pretty quickly (sitting out for the usually considered "safe" time of 2 hours is not recommended with milk, due to it's considerable natural bacterial load), and ~45 degrees is really the maximum storage temperature you should consider (even then, the taste will go off. 40 is the recommended temp).

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We created the model question above as a canonical answer to all of these "I left it out" questions... –  SAJ14SAJ Oct 10 '13 at 15:27
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