When a salad has gone bad the salads lettuce and other vegetables will usually change colors and it may change to a brown like color and you may also notice the salad becoming slimy or soggy and it can have a rotten smell.
If the salad has a rotten smell to it or the color has changed then throw it out as the salad is bad and can make you sick.
A salad in the refrigerator should last for 3 to 7 days but it's best to eat the salad within 3 days of refrigerating it.
A salad will last in the fridge for 3 to 7 days.
If you have any meats such as bacon, ham, chicken etc then the salad will spoil faster than it would without the meat.
Salads that are made with meat should be eaten within 3 days of refrigerating them as the meat can spoil and make you sick.
If the salad has not meat and is just a vegetarian salad then the salad can last up to a week in some cases.
However it's best to eat the salad within a few days of refrigerating it.
You can freeze salads to keep them longer but if not frozen properly the salads can become soggy.
I always just makes fresh salads and only keep the salad for a few days at most.