Garlic Varieties That Suit North Dakota Winters

Both hardneck and softneck garlic will get through a North Dakota winter just fine, but if you only want to plant once and not think about it again, go hardneck — it takes an open, windy, mulch-free winter without complaint. So walk your yard now, before the ground cools, and pick a spot with good drainage and full sun, because that’s where the cloves are going in early September. Everything else — which of the fourteen varieties, how deep, how far ahead of frost — follows from that one patch of dirt.

The short answer for North Dakota

Both hardneck and softneck garlic grow well in North Dakota, but hardneck types are the safer default because they shrug off the open winters of the Northern Plains without heavy mulch. Growers near Fargo work back from a first fall frost of September 25 to October 5, the window NOAA’s National Centers for Environmental Information calculates from 1991-2020 climate normals at the Fargo airport station. Planting in early September to mid September puts cloves in the ground while soil is still warm enough to root before that freeze arrives.

That window is a midpoint, not a guarantee. In roughly half of all years the freeze lands after October 5, and in the other half it arrives before September 25. A grower who waits until the frost date itself to plant has already given up two or three weeks of root-building time.

Cloves planted this fall bulb up underground over the following months and are lifted the next summer, not before. The reason garlic in general does well here, hardneck and softneck alike, is cold exposure. University of Georgia Extension bulletin C854 sets the requirement for a bulb to differentiate into cloves at six to eight weeks below 40°F, and Fargo’s cold season runs 30.4 weeks below that mark, nearly four times the minimum. That surplus is why almost any hardneck cultivar can be planted this far north without worrying whether winter will run long enough.

Which varieties are on this list

Within the varieties this page can confirm by catalogue record, the softneck options braid well and store the longest: Early Red Italian, Inchelium Red, Italian Late and Lorz Italian. The hardneck side is longer and generally better suited to the coldest counties: Bavarian Purple, Blue Music, Chesnok Red, Duganski, Fall Festival, Georgian Crystal, Georgian Fire, German Red, German White and Ivan.

• Softneck: Early Red Italian, Inchelium Red, Italian Late, Lorz Italian
• Hardneck: Bavarian Purple, Blue Music, Chesnok Red, Duganski, Fall Festival, Georgian Crystal, Georgian Fire, German Red, German White, Ivan
• All fourteen names share the same planting window: early September to mid September

Working it out for your own garden

The September 25 to October 5 window belongs to the Fargo airport weather station, the source behind NOAA’s 1991-2020 climate normals used above. If you garden near Fargo, count backward from that window: early September to mid September lands cloves roughly three to four weeks ahead of the frost date, the gap between September 1-10 and the September 25-October 5 freeze range. That gap lets a clove root out before the ground stiffens, without giving top growth so much of a head start that an early freeze catches it above the soil line. For the full week-by-week countdown from frost date to planting day, see When to Plant Garlic in North Dakota: Counting Back From the First Frost.

Your own county’s frost date is not the Fargo figure. NOAA builds its normals station by station, and North Dakota has dozens of them scattered from the Red River Valley to the Badlands. A garden sixty miles from Fargo, at a different elevation or on different soil, commonly sees its first fall frost a week or two earlier or later than the reference figure above.

How to redo the math for your district

Start with your nearest station’s own first-fall-frost normal, if you can find one closer than Fargo. Then work the same three-to-four-week gap backward from that date to build your own planting window. A garden whose frost typically lands earlier in September, for instance, should shift its whole planting window a week or so earlier than the range that fits Fargo.

The other variable worth checking locally is soil temperature at planting depth, since garlic roots respond to soil warmth more than to air temperature. Soil lags air by weeks and swings less through a cold snap, so a clove planted right before a frost is not doomed outright. What a too-late planting date costs is a slower start to root growth, and a shallow root system going into winter is more likely to heave out of the soil during the freeze-thaw cycles that follow.

What changes across North Dakota

The Red River Valley, where Fargo sits, is flat and low-lying, and cold air pools there on clear autumn nights, so the valley floor can reach freezing before higher ground a few miles to either side. Heavy clay soils in the valley hold moisture well, which buffers soil temperature swings but slows drainage, and a badly timed early snow can leave cloves sitting in saturated ground rather than settling into the below-freezing dormancy they need.

Region by region

Western North Dakota, including the higher ground around the Badlands and the Missouri Coteau, sits at greater elevation than the Fargo station and typically cools faster once autumn arrives. Growers there should expect their own first frost to run ahead of the Fargo window, not behind it, and should plan to plant earlier within, or even before, the early September to mid September range this page uses.

North central North Dakota, around Devils Lake, sits near the state’s largest natural lake, and a large body of water moderates the air close to its shoreline. Gardens right on the lake can lag a few days behind inland sites at the same latitude, while gardens even a short distance from the water behave like the rest of the region.

None of these differences change which cultivars will grow here. They change only when to put cloves in the ground. A hardneck like Duganski or a softneck like Italian Late tolerates the same range of North Dakota winters no matter which side of the state it’s planted on. What moves across the map is the calendar, not the variety list.

The mistakes this climate punishes

North Dakota’s winters reward growers who plant early and deep, and punish the mistake of planting too late, trusting the frost date itself as a deadline rather than as the finish line for root growth. Waiting until the calendar says frost leaves cloves with only a few days of soil warmth to root before the ground stiffens, and a clove that hasn’t rooted going into a hard freeze is far more likely to heave out of the soil during the freeze-thaw cycles that follow.

Disease pressure to watch, not to dismiss

Soil disease is more a planting-stock problem than a climate problem, but it’s worth knowing which pathogens find North Dakota’s growing season hospitable. Counting the months from September through July whose average air temperature falls inside each disease’s published range, using the reference figures from UC IPM’s Pest Management Guidelines for Onion and Garlic (UC ANR Publication 3453), gives the table below.

Those thresholds are published as soil temperatures, and the count above uses air temperature, which swings faster and wider than soil ever does. A month averaging 65°F still holds days near 50°F and days near 80°F, so a monthly mean landing inside a range is not the same as the whole month favoring the disease. None of this means white rot or fusarium basal rot are guaranteed here, and a reading outside a pathogen’s range never means the disease is impossible. Both organisms survive for years in soil and travel almost always on infected seed cloves, which is why buying certified, disease-free seed stock matters more in this climate than choosing one cultivar over another.

Checking this against your county

Fargo’s numbers are a starting point, not a verdict on your own soil. For a frost date closer to your own county, or for planting guidance tuned to your part of the state, contact the North Dakota State University Extension Service, which maintains county offices statewide. Ask specifically for your county’s first fall frost normal, not just a regional average, since the Red River Valley, the Badlands and the north-central lake country each behave differently within the same state. If your county office can’t supply a station-specific figure, the Fargo window used in this article, three to four weeks before the September 25 to October 5 freeze, is a reasonable proxy for most of the eastern half of the state.

Before you plant, it helps to work through the basic sequence of soil prep, clove separation and spacing that every North Dakota garlic bed depends on, covered in Growing Garlic in North Dakota.

Common questions

Can I plant garlic in spring instead of fall in North Dakota?

You can, but expect smaller bulbs. Garlic needs a stretch of cold weeks to trigger the bulb to divide into cloves, and a spring-planted clove misses most of that cold period, so it often grows on as a single round rather than a full head.

Does snow cover protect garlic over winter?

Yes, snow acts as insulation once it settles, but you can’t count on it arriving before the ground freezes hard. A layer of straw mulch put down at planting protects cloves during the gap between the first freeze and the season’s first real snowpack.

Is it okay to plant garlic from the grocery store?

It’s a risk not worth taking. Grocery garlic is often treated to slow sprouting, it isn’t identified by cultivar, and it can carry soilborne pathogens like white rot into a bed that would otherwise stay clean for years. Certified seed stock from a named cultivar costs more but avoids both problems.

How do I know if my garlic rotted in the ground over winter versus just being slow to come up?

Dig one clove carefully in early spring before assuming the worst. A clove that rooted but is slow to push a shoot will still show firm, white roots and a solid clove; one that rotted will be soft, discolored or hollow. Spring emergence in North Dakota can be uneven even in a healthy bed, so don’t pull a whole row on the strength of one late sprout.