I have been looking at Acer macrophyllum Mocha Rose on the internet. Sites are giving mixed info on what climate zone it can live in. Anywhere between 5a and 7 are whats being shown. I'm located in the 5b zone. Has anyone successfully wintered this tree in 5b or colder?
Short answer: Doesn't look very promising for zone 5. I unfortunately don't have experience with this tree, but can provide some information to guide you. See full Climate section from the link below: Bigleaf Maple (Acer macrophyllum) | Oregon Wood Innovation Center Specifically: "We have little rmation concerning susceptibility of bigleaf maple to cold, ice, and snow. A low tolerance to cold and snow is indicated by the absence of maple at higher elevations and by its narrow coastal range. Cold temperatures probably limit the northern occurrence of bigleaf maple." Given the information I would caution against it if planted in the ground in zone 5. I hope this information is helpful to you. I also hope that a member of the forum replies that has experience growing this maple in cold end of it's zone that can give first hand experience. Based on the information from the Oregon State University in the link above, you will be in uncharted territory and taking a big risk. Further support from the grower that introduced this variety: "I have grown other cultivars of A. macrophyllum, such as 'Seattle Sentinel' and 'Kimballiae', but the USDA zone 6 (-10F) limits sales." Included in this link is additional first hand experience you might find helpful in making your decision: Flora Wonder Blog: The Maples of Oregon If you share the qualities you like in this tree and some of the site conditions along with things you hope to achieve by the tree; myself and many others could recommend a good maple that achieves those things that is better suited for your area.
It is a beautiful maple, I wish we had it in EU. I wonder if @directorrod has tried it, he's in either 5a or 5b. Don't remember which, but it's a rough zone.
