Many camps have not updated their websites for 2012. They've posted messages on their sites telling visitors to "visit us again in January or February for 2012 summer camp information," or something to that effect.
Instead, I suggest putting a email sign up box on your site with a message like, "Enter your email address so we can notify you when our site has been updated for the new year."
Not only is this a good way to build your email list, you're not leaving it to prospects to remember to revisit your website in a few months. You're contacting them hoping they'll get back in touch with you.