We recieved a big package of info from the School authorities along with enrolment forms last month.
There was an info night scheduled, and a listing of all the Hort programmes.
I suggest you contact the 'Schuldienst' - school information office - and ask them. I'm aware that they might register your child according to the Hort you need, or make other suggestions.
There are also private Hort programmes around - on Tuesdays the Tufi-Hof take kindergarteners and the lady who runs the programme comes up to our school to pick the kids up with the horse and buggy....