At your local homebrew supply store, the grains are probably stored in bins or barrels at room temperature. In contrast, the hops are — or should be — refrigerated. The hops are stored cold for a reason — because fresher hops taste better.
Outside of bittering additions, adding hops during the boil is inefficient as many of the essential oils and positive attributes being sought are lost to heat. Instead, save those hops for whirlpooling or dry hopping.