The danger zone for raw meat is 40°F to 140°F. You shouldn't have raw meat in this danger zone for more than 2 hours. Depending on when your started your crockpot it's temperature probably got higher than 140°F before 1:30PM. It would take time for the corkpot's temperature to come down without the lid being removed. The power was out for 3.5 hours, so just depends on how long it took your crockpot temperature to get back into the danger zone and how far cooked your ribs were already.
My guess would be your fine, especially if you had started the crock in the morning.
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