In terms of type of seed, the same type that you'd use in fall can be used in spring. But I think you may be asking, How long does grass seed stay viable? The answer varies according to the grass seed and the conditions, but a bag of old grass seed won't go as far as a bag of new grass seed. I've heard that each year grass seed sits around, you'll lose up to 10% germination.
So the question becomes one of how to use old grass seed most effectively. To be safe, I would buy a small amount of new grass seed to mix with the old grass seed. When you sow the grass seed with your lawn spreader, use a slightly higher setting (so that you're releasing a slightly greater amount of grass seed than is called for).
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