Winter lows in USDA plant hardiness zone 3 typically fall between minus 30 and minus 40 degrees Fahrenheit. Much of North Dakota, where Dolgo crabapple trees thrive, lies in zone 3. These exceptionally hardy trees are often used as rootstock for grafting less cold-tolerant apples.
About this Author
A freelance writer, Judy Wolfe has owned Prose for the Pros, a freelance writing business, since 2006. She's been an inveterate traveler since 1961 and draws on her travel experiences to provide articles for such websites as Chincoteague Island Vacations and Berlin Dude. Wolfe holds a Bachelor of Arts in literature from California State University at Pomona.