Put all of the ingredients in a large 90-ounce capacity blender jar. Make in batches when using a smaller blender.
Add the cover and blend until smooth.
Pour into glasses, garnish with cranberries, and serve immediately.
Video
Notes
One: Make Ahead
Prepare up to 2 hours ahead of time. Instead of pouring it into cups, place the plastic blender jar with the lid on (or pour it into a plastic pitcher with a lid) into the freezer!
Set a timer and give the blender jar a shake every 20-30 minutes so that the juice doesn’t freeze solid.
Remove the blender jar from the freezer and shake or stir to combine. Or return it to the blender and whip it back together for a few seconds.
Two: Variations
Lime Cranberry: Add sweetened lime juice to the blender and garnish the drink glasses with lime wedges.
Orange Cranberry: Add frozen orange juice concentrate in addition to the cranberry concentrate for a Christmas flavored orange julius.
Cranberry Pomegranate: Add some chilled pomegranate juice to the blender and garnish the drinks with pomegranate arils.
Pineapple Cranberry: Add pineapple chunks or frozen pineapple juice concentrate to the blender