FF.....That's a lot of Wheatgrass Juice to fill a whole Ice Cube Tray. You sound excited about what you're doing. I 'feel' your enthusiasm. Keep it up. However, I'm not sure about freezing Wheatgrass Juice.
I like to drink my Wheatgrass Juice, by itself, first thing in the morning. I take 2 to 4 ounces. I follow it soon after with Celery Juice. I usually have a second srving in the evening. Whatever works for you....right?.....WY
P.S. By-the-way, do you grow your own Wheatgrass?