If we need more help, they hire. They seem to do the most hiring of CNA's around May and then again in December. These are the months that the CNA's that are graduating from nursing school.
I think I sent in my resume in January even though they had no openings. They called me about 2 months later for an interview. Some places will accept resumes even if there isn't any openings, others won't. You just have to ask.