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Grain... how old is too old?

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As long as it’s still reasonably crisp/crunchy when you eat some raw kernels and the flavor is ok, you should be fine to use it.
 
You’re fine. I did an experiment and brewed 2 beers. One with fresh malt and one with malt that had been stored in a hot/cold/hot/cold attic for 2 years.

Tasters could not tell a difference.

However, now I vacuum seal my malt 10lbs at a time. Keeps it super fresh.
 
I've used grain that was stored for over a year after being crushed with good results.

I'm a grain farmer. You'd be surprised by how old your "fresh" malt really is. It's not uncommon for grain to be stored on the farm for up to a year before it begins the lengthy journey through the system which, eventually, ends in the back of your LHBS.

Mark
 
Taste it. If it tastes fine, it is good. If stored dry and bug free, it will keep for many years.

I have a lot of specialty grains, and some get left for years. I'll still use it if it is 5+ years old. My base grains get used within a couple of years. I think I did toss some recently, it was from 2000, I'd been avoiding using it for years because it was so old, but thought ..... I might just need this .... It just got too old. It didn't seem bad when I tossed it.
 
I have a few hundred pounds in 4 mil barrel liners (big plastic bags) inside garbage cans that I haven't touched for a few years. I hope it's still good when I get to it.
 
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