We all know chess is not a short term activity. You can't expect anything by just signing up for a few weeks. In fact, each of my Steps lasts for a school year. We start with basic workbook, more exercises with extra workbook, and additional topics with plus workbook. After one school year, students will finish at least 1000 problems. We can consider to move them to the next step. Some students may continue with more chess classes in summer.
Many students will continue their chess study for the whole school year. If you try to get in in winter and if you are lucky to get in, you will have missed the lessons for basic theory and one-third of material. If you try to get in in spring, most likely I will suggest you wait for next year, or go to lower step. The additional topics would be too difficult if you never had earlier lessons.
Of course, any time to start chess is good and not late. But to reap the greatest benefit, please consider chess in fall, maybe even begin to think about it in late summer. When the fall quarter starts, most seats are already gone. More than half of my classes are full before we kick off the first lesson.