When to plant garlic in North Dakota
North Dakota’s average last spring frost is May 15, and the first fall frost typically arrives around September 20 — about 128 frost-free days (USDA zones 3a, 3b, 4a, 4b). Garlic needs 240–270 days to mature, which is tight for a full-season planting there — see the note below.
When to plant garlic in North Dakota: the short answer
For a spring planting, sow Oct 1 – Oct 18. Seeds germinate in soil from 32 to 75°F.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow garlic in North Dakota, step by step
- Prepare the bed. It needs at least six to eight hours of direct sun a day and loose soil at least 12 inches deep, with a pH between 5.5 and 7.5. Dig in compost before planting.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: onion maggot, onion thrips, stem nematode. Diseases and disorders: white rot, rust, basal rot.
- Harvest. Garlic takes 240-270 days to reach harvest. Plant cloves 2-4 weeks after the first fall frost, pointy end up, and mulch. Hardneck types need this cold period; softneck types suit mild-winter regions and braid well. Harvest the following summer when the lower leaves brown.
Figures come from our crop data; dates use North Dakota’s average frost dates. More in the full garlic growing guide.
Garlic planting dates by USDA zone in North Dakota
North Dakota spans USDA zones 3a, 3b, 4a, 4b. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the garlic dates shift with them.
When to plant garlic in nearby states
| State | Last frost | Plant in fall |
|---|---|---|
| North Dakota (this page) | May 15 | Oct 1 – Oct 18 |
| South Dakota | May 10 | Oct 6 – Oct 23 |
| Nebraska | April 30 | Oct 16 – Nov 2 |
| Kansas | April 15 | Oct 31 – Nov 17 |
| Oklahoma | April 1 | Nov 12 – Nov 29 |
Questions gardeners in North Dakota ask
When is the best time to plant garlic in North Dakota?
Plant garlic in North Dakota between October 1 and October 18. That timing is set for fall, after North Dakota's first frost (about September 20).
When will fall-planted garlic be ready in North Dakota?
The following May to June. Garlic roots in fall, rests over winter and finishes in early summer - harvest when the lower leaves turn brown.
When is the last frost in North Dakota?
On average around May 15, with the first fall frost around September 20 - about 128 frost-free days. Your town may differ by two weeks or more.