I'm about to make my first AG and I went to the lhbs on Wednesday and I bought some grains and they milled them for me. The guy working there said they don't mill the grains till they sell them because it keeps them fresher. My question is, how long do milled grains stay fresh for?
As long as you keep them sealed and dry, quite awhile. I've had months-old milled grains that smelled and tasted just fine.
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I don't have a mill & my LHBS mills for free. But, they are 45 min away, so I usually pick up 2 months worth of grain at a time. As long as it is stored in an air tight container & kept cool it will be fine.