Thanks everyone for the replies!
I ended up making and seasoning the patties then wrapping 2 at a time in saran wrap then put them into freezer ziplocs. I took out 4 patties several days later and they unwrapped perfectly - no sticking! Tossed them on the grill and they were great.
I'm just a Dad who loves food and I live in a house full of fussy eaters... it's a challenge!