The short answer is "maybe", but it depends on two things: which seeds you have left over and how they were stored. Certain seeds like parsnips and onions should be bought fresh every year while many others can easily remain viable for 2-3 years if not more. To know which ones store well, you can consult the chart below. Seed longevity charts like this one, however, assume optimal storage conditions: cool, dark and dry conditions. If your seeds were not stored in those conditions, it doesn't mean they won't sprout. Many most likely will but rather the longer you hold onto them, the lower the probability that they will germinate.
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