Box Huckleberry Chill Hour Requirements?

I'm looking to grow a small food forest on a north facing hill in a foggy environment with no chill hours (Pacifica, CA), and saw that Burnt Ridge Nursery has some box huckleberry varieties that say N/A for chill hours. I've been having trouble finding more information on box huckleberry chill hours, and am wondering if anyone had any more experience/knowledge here?