For every crag you can see when during the year the ascents were recorded. Magic Wood is clearly a summer place but it is quite popular from May to October.
Temps in spring and autumn are best (not as hot as in summer, but still not freezing), but it takes a lot of time until the snow has thawed, so it might be wet if you visit in the spring. It usually gets better at the end of april / start of mai I think, but im not 100% sure....
Jonas is absolutely right... season really starts from beginnig of may. beforehand climbing is possible, but the snow is melting and the ground is pretty soaked. happy bouldering and spring is coming soon!
Magic wood