I can't help you with the freezing part but I've found that Navel Orange Juice tastes fine for a lot longer than 6 hours. I usually only squeeze enough for that day and part of the next so 24 hours seems to be fine and probably 36. It is definitely bitter after 2-3 days.

GregBradley, good to know the threshold. There just isn't much clear cut info to be had on the subject.

Clint,

It isn't the orange that is the problem it is you, the juicer. On navels you have to juice them lightly and avoid the navel end and you won't have that bitterness problem. Try to get 90% of the juice and leave the juice at the ends and voila no bitterness. It is a well known Navel orange issue but easily worked around.

Hi citrus people! I'm not getting much feedback on freezing navel orange juice, but wanted to pass along my results. The juice is dog-gone-good so far as ice cubes. I'm squeezing them all the way. My Washington navels have been holding so long that they are tacky to the touch with sweetness. I sampled some ice cubes and I feel like I've been eating candy. It would be an absolute shame if they turned bitter after time.