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Grain: how old is too old?

I just discovered a bag of mixed grain I crushed 5 or so months ago for a batch, and then never got around to brewing. It’s been stored in a cool, dry dark place, but 5 months is a long time.

What do you think? Toss it? Or might it still be used to brew a good beer?

Was it in an airtight container?

Either way you could try to brew with it expecting lower efficiency and have some dme on hand if the OG is too low.

Taste it. If it tastes stale or chewy, get rid of it. If it tastes fresh and crunchy, you’re good.

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