Share 'Limited Availability.'

I'm quite keen on obtaining one of these summer positions, but I'm sort of stuck pondering whether or not its worth the application process because of my availability dates. I'm really only going to be up from about the 20th of May until the 20th of August. I'm most interested in working out west on a ranch or at an Alaskan lodge, but it seems that most online applications have quite a rant on...