When can I transplant strawberries in 6b?

New to gardening. I had strawberry starts last year. The container I put them in was not a good size for them. They still produced and they survived the winter. I’m wanting to move them over to a raised bed, but I’m not sure when to make the move?

Is there a better option than a raised bed? I saw a lady on YouTube doing a “crate tower”. I have a copious amount of milk crates. Should I do this instead?