I prefer to lay them out on baking sheets to sort them, as it gives you a better view of the berries.
Pick out and remove any bits of stems, leaves, and unripe, soft, or mushy Saskatoons.
Wash the berries under cool water, in a large sieve, or a colander to remove as much water as possible. I usually let them sit for about 10 minutes in the colander.
This is another opportunity to do quality assurance and make sure that you get all of the bad berries, stems, bits of leaves, critters, etc (I found 2 spiders in my last batch of berries!)
Lay a tea towel on the baking sheets and put the wet berries on the towel.Pat them dry with a paper towel or another tea towel.
Line a cookie sheet with parchment paper and lay the dried berries on the parchment paper.
Place them in your freezer for 4-6 hours.Then transfer to a storage container or Ziploc freezer bag, pushing out as much air as possible before sealing.