In reply to katiep:
I have been to Arco in June twice . One year it was way too hot and the other year it was where we went to warm up as the dollies around sella and cortina were too cold and snowy for the big routes/VF's .
I'd start at Arco and move up to higher altitude for routes/VF as weather allows . there is arock fax guide for the sport climbing and cicerone to a 2 volume VF guide.Vol 2 covers arco . Thereis also a newer ( Last Year ) rockfax guide to the dollies with trad sport and VF but it doesn't cover arco. Have a great time