U.S.N.A. claims USDA 3 for the Kosar and De Vos hybrids - see my response to your other post.

That sounds encouraging, but a nursery about about 40 minutes from my home quotes 5b, so that's why I'm wondering what personal experience others have had. It's annoying that there is often discrepancies between different sites. http://plants.carletonplacenursery.com/11090004/Plant/267/Ann_Magnolia

Yep. My aunt has grown Ann in zone 4 Minneapolis for 4 or 5 years.

Thanks for the responses. Oh I am relieved. I ordered Ann and put her in my garden a month ago. Can't wait till next spring.