You can freeze bean sprouts but they should be blanched first either through a good single layer steaming for 3 minutes, or boiling for 3-5 minutes. Doing this will prolong the freezer life of the sprouts by destroying certain enzymes that cause loss of flavor and nutritional value, as well as degraded appearance. Without blanching, you could probably get away with freezing for a week or two.

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The best possible method for the storage of bean sprouts is to place them in a shallow dish of water and keep in the fridge, changing the water daily. Sprouts can be kept fresh with this method for up to 2 weeks. Not as long as freezing, but it doesn’t require blanching, and the sprouts will be exceptionally fresh most of that time.