Garlic is the one crop where planting in fall is not a shoulder-season consolation prize. It is the only sensible time to do it. Cloves go in as the garden is being put to bed, sit through winter, and come out the following summer as full heads. Get the timing right and it is close to the least demanding crop in the garden. Get it wrong by a month in either direction and you harvest something disappointing.
The timing rule is not the one most people repeat.
Plant at the first frost, not six weeks before it
The common advice is “plant garlic four to six weeks before your first frost”. That advice is borrowed from crops that need to size up before winter, like spinach and overwintered onions, and it is too early for garlic.
What garlic actually needs is two things that pull in opposite directions. It needs enough time in the ground to grow roots before the soil freezes hard, which argues for planting early. And it needs the soil to be cool enough that it does not push a lot of top growth, because tall green leaves going into December get burned back and waste the clove’s stored energy, which argues for planting late.
The window that satisfies both is from roughly your average first frost through the following four weeks. By the first frost the soil is cool but the ground is nowhere near frozen, and there are typically another four to six weeks of root-growing weather left. That is the window in the table below.
Find your frost date first
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Garlic planting window by USDA zone
| Zone | Average first frost | Plant between | Harvest around |
|---|---|---|---|
| 3a | Sep 15 | Sep 15 – Oct 13 | Jun 10 |
| 3b | Sep 18 | Sep 18 – Oct 16 | Jun 13 |
| 4a | Sep 22 | Sep 22 – Oct 20 | Jun 17 |
| 4b | Sep 28 | Sep 28 – Oct 26 | Jun 23 |
| 5a | Oct 3 | Oct 3 – Oct 31 | Jun 28 |
| 5b | Oct 8 | Oct 8 – Nov 5 | Jul 3 |
| 6a | Oct 13 | Oct 13 – Nov 10 | Jul 8 |
| 6b | Oct 18 | Oct 18 – Nov 15 | Jul 13 |
| 7a | Oct 25 | Oct 25 – Nov 22 | Jul 20 |
| 7b | Nov 1 | Nov 1 – Nov 29 | Jul 27 |
| 8a | Nov 8 | Nov 8 – Dec 6 | Aug 3 |
| 8b | Nov 15 | Nov 15 – Dec 13 | Aug 10 |
| 9a | Nov 30 | Nov 30 – Dec 28 | Aug 25 |
| 9b | Dec 10 | Dec 10 – Jan 7 | Sep 4 |
| 10a | Dec 20 | Dec 20 – Jan 17 | Sep 14 |
| 10b | Dec 31 | Dec 31 – Jan 28 | Sep 25 |
| 11a and up | none | Nov to Dec | following summer |
Harvest dates assume roughly 240 days in the ground, which is typical, and they are a starting point rather than a date to mark. The plant tells you when it is ready, and the signal is described below.
Per-zone detail, including what else goes in at the same time, is on the garlic crop page and on each zone page.
Hardneck or softneck, decided by your winter
This choice is mostly a function of climate, which makes it a zone question.
Hardneck (rocambole, porcelain, purple stripe) evolved for real winters and needs one. It sends up a central flower stalk, the scape, which you snap off in June and cook. Cloves are large, few, and easy to peel, and the heads store four to six months. Plant hardneck in zone 6 and colder, where it performs best.
Softneck (artichoke, silverskin) tolerates mild winters, produces no scape, has more and smaller cloves in overlapping layers, braids because the neck stays pliable, and stores eight to twelve months. This is what almost all commercial garlic is. Plant softneck in zone 7 and warmer.
In zones 6 and 7 both work, and planting some of each is the sensible hedge.
In zone 8 and warmer there is a further problem: winters may not deliver the sustained cold that triggers bulbing. The fix is vernalization, which means refrigerating the seed cloves at about 40 degrees for six to eight weeks before planting. Buy early, put the heads in a paper bag in the crisper in October, and plant in December.
How to plant
Break the heads into cloves the day you plant, not before, because a peeled or separated clove starts drying out immediately. Leave the papery wrapper on each clove. Plant only the biggest cloves, since clove size at planting is the single best predictor of head size at harvest. Cook the small inner ones.
Set each clove pointed end up, flat root plate down. Two inches deep to the top of the clove in zone 7 and warmer, three to four inches in zone 5 and colder. The deeper planting in cold zones is not about cold tolerance, it is about frost heaving: repeated freeze and thaw cycles push shallowly planted cloves out of the soil, and that is the most common cause of winter loss.
Space cloves six inches apart in rows twelve inches apart. Garlic is a poor competitor against weeds and sizes down noticeably when crowded.
Then mulch, and do not skip this. Four to six inches of straw or shredded leaves in zones 3 to 6, two to three inches in zone 7 and warmer. Mulch moderates the freeze and thaw cycling that heaves cloves, keeps the soil temperature steadier, and suppresses the spring weeds that would otherwise cost you bulb size. In cold zones leave the mulch in place through spring and let the shoots push through it.
Garlic wants full sun, loose soil, and good drainage above all. A clove sitting in a waterlogged bed all winter rots. If your soil is heavy, plant in a raised bed or a mounded row.
Through the season
Shoots may appear before winter in zones 7 and warmer, and that is fine. Green growth in November does not mean you planted too early unless it is substantial.
In spring, the crop wants nitrogen early and then nothing. Feed once when growth resumes and again about a month later, then stop, because late nitrogen produces leaves at the expense of bulb.
Snap scapes off hardneck varieties when they curl, usually June. Leaving them on costs measurable bulb size, and the scapes themselves are one of the better things to come out of a garden.
Stop watering two to three weeks before harvest. Wet soil at the end produces stained wrappers and bulbs that store badly.
Harvest when roughly the bottom third to half of the leaves have browned and the upper leaves are still green. Each leaf corresponds to a wrapper layer around the head, so waiting until everything is brown means the wrappers have already broken down and the head will split in storage and rot quickly. Lift with a fork rather than pulling by the stem.
Cure for two to four weeks somewhere dry, shaded, and airy, with the tops still attached. Then trim, and store somewhere cool and dry, but not in the refrigerator, which pushes garlic toward sprouting.
What goes wrong
Planting too early, in August or early September in a cold zone, produces a lot of top growth that winter destroys, and a smaller head. Planting spring cloves in zone 8 usually produces a single undivided round because the cold requirement was never met. Skipping mulch in zones 3 to 5 loses cloves to heaving. Harvesting too late splits the wrappers and kills storage life. And planting supermarket garlic introduces the possibility of importing white rot or stem nematode into a bed you will be using for decades.
If you are working out the rest of your autumn schedule, the fall planting calendar by zone covers the crops that are sown now for a harvest this year, and first frost dates and frost protection covers what the date in the table above actually represents.