DO NOT FREEZE YOUR SEEDS EVER!! Seeds kept in deep freeze are done so in a particular way as to hold the moisture inside the seed that already exists. Your freezer will cause the moisture to leak out due to slight thaw and de-thaw from temperature flux.
Short term freezing, if well sealed, is not only not a problem but it can be beneficial for germination, or at least in some cases. It better mimics the sesonal transition some seeds would experience in nature.
An acquaintance who is also in the nursery business learned about freezing seeds for a week to two weeks prior to germinating them and then placing them in a refrigerator for a slow thaw and then germinating them from a botany Prof. at NC State University and tried it. I do not recall all the numbers but he germinated 1000 seeds the first try, obviously not cannabis seeds, and he had the best germination percentage he ever had, very close to 100%. Subsequent attempt results were virtually the same.
I would have to question the usefulness of freezing seeds that were from landrace strains from regions where it does not freeze but considering the large number of other strains from regions that do have freezing temperatures and the large number of crossed strains that have higher percentages of strains from cold weather areas it would only be logical that properly freezing those types of seeds for the short term would not only not be of any risk but likely could be beneficial.
But for long term storage freezing could be risky. As mentioned they will eventually dry out and for what it would take to stop that from occurring would be difficult for most people to do.
