Is it safe to eat canned salmon passed the expiration date?
no, bacteria could have build within the food
I take it you are referring to a shelf-stable, non-refrigerated product. Not all processors of canned salmon will necessarily place an open 'best by' date on the can. If you have concerns about the age of the canned food, contact the processor directly. When you give them the code that is embossed or printed on the end of the can, they should be able to tell you how old it is. Contact information should be…
Is it safe to eat canned food past expiration date if the can were exposed to summer heat and freezing in the winter?
If you are talking about shelf stable canned crab meat, the date on the can is likely the 'best by' date and not an expiration. If the can is unopened, has been stored properly and is not swollen or damaged, it is likely safe to eat, but the palatability of the crab meat will deteriorate over time. The processor will not guarantee the product beyond the recommended 'use by' date.
About 2 years. Look on the jar or can, there should be an expiration date. Many people don't realize that canned/jarred foods have an expiration date on them. Even foods such as canned vegetables, evaporated milk, etc. have expiration dates on them. Also, always check the can for signs of bulging, especially on tomato products. If there is even the slightest sign of bulging, THROW IT OUT! Botulism is the most dangerous form of food…
That depends how long after the expiration, how it has been stored and the condition of the can. Usually, canned food has a "best by", not an "expiration". If the "expiration" is recent and the can has been stored properly and is in good condition, the contents could be safe. Whether or not to use it would be your decision.