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North Dakota: Vegetable Planting Calendar. Planting vegetable seeds or transplants at the correct time is important for getting the most out of your garden. Knowing your first and last frost dates will help you start your vegetable seeds at the right time. North Dakota is in USDA plant hardiness zones 3-4. North Dakota Last & First Frost Dates. *Based on statistics there is a 10% chance that frost will occur before or after these dates. Watch your local weather for more accurate dates.
Jonine Smith said Billings has been rated a Zone 3-4 and may be a strong 4 now.. Chip Smith said he has a lot of Zone 5 material that won't grow here on a sustained basis. Jason Marble, of Billings Nursery and Landscaping, said he would not plant a Zone 5 tree. Zone 4 is defined as when the average low temperature of the year is from 20 below to 30 below Fahrenheit. Zone 5 is rated at 10 below through 20 below.