I did not get Rosemary to survive in the greater Chicago area, but now in a dry climate with low temps bottoming out at -10 people with priviledged microsites can get them to survive. I assume you are trying the hardiest ones, Arp, Madline Hill, and Hall's Hardy. The prostrate ones are signficantly less hardy. I am waiting to see if my new spot at the base of a stone raised bed facing south will work, all the success stories here are in south facing sites, protected on the north side.