Harvest the flower cones once they dry completely on the vines in late summer. Hops cones feel papery and are fragrant when dry.
Spread the cones in a single layer on a window screen. Set the screen in a dry, well-ventilated area. Choose a location protected from breezes that can blow the cones off the screen.
Dry the cones for seven to 10 days. Thoroughly dried cones shatter when folded in half.
Place the dried cones in a tightly sealed storage bag. Press as much air out of the bag as possible before sealing it closed.
Store the bag in a cool, dry place, such as a refrigerator or basement storage area. Alternatively, freeze the cones until you are ready to use them. Store frozen hops for up to one year.