Mix the sugar, vinegar, celery seed, and salt in a bowl big enough to hold the sliced cucumbers.
Place the cucumbers in the bowl and toss to coat. Put a lid on the bowl and refrigerate for 24 hours.
Place the cucumbers and brine in freezer safe jars or container, leaving an inch room of headspace for freezing, and freeze for up to a year.
When ready to eat, thaw them in the fridge for a few hours or overnight. They will stay crisp and delicious for a couple of weeks.
Notes
These start to lose their crispness after a couple of weeks, but that is not a problem, they definitely won't last that long.A mandoline makes slicing the cucumbers easy.