When to Plant Garlic: 7 Simple Tips for Bigger Bulbs
If you only remember one thing about when to plant garlic, make it this: plant in fall, about four to six weeks before the ground freezes. That gives the cloves time to grow roots before winter, so they can surge into leaf growth in spring and swell into full bulbs by summer.
Garlic rewards patience. Plant it too early and it sends up tender tops that frost can damage. Plant it too late and the roots never settle in. This guide explains when to plant garlic in your region, how to adjust for your USDA zone, and six more tips for a bigger harvest.
If you’re planning the rest of your autumn beds too, see our guide on what to plant in October by zone.
When to Plant Garlic: The Short Answer
The best time to plant garlic is in fall, roughly four to six weeks before your soil freezes. For most of the U.S., that means late September through November. Cold regions plant first and warm regions plant last. University of Illinois Extension gives the same four-to-six-week window.
Not sure when to plant garlic where you live? Start with your first expected frost date. Cold-climate guidance from University of Minnesota Extension puts the sweet spot within about two weeks of that first frost.
Why Fall Is the Right Season
Garlic needs a cold spell to form good bulbs. University of Wisconsin Extension explains that the cloves must be exposed to cool temperatures for next year’s growth to form bulbs. Fall planting lets that happen naturally.
Roots grow through fall and winter. By early spring, those roots can support the fast leaf growth that builds large bulbs, according to Oregon State University Extension. Once you see that, when to plant garlic stops feeling like guesswork.
7 Simple Tips for a Bigger Garlic Harvest
Tip 1: Plant Four to Six Weeks Before the Ground Freezes
This is the main rule for when to plant garlic. You want roots established, with at most a small green tip showing. Minnesota Extension warns that garlic growing too fast in fall is more prone to frost damage.
Tip 2: Use Your USDA Zone to Narrow Down When to Plant Garlic
Your hardiness zone is the fastest way to narrow down your window. Look yours up on the USDA Plant Hardiness Zone Map, then use this table.
| USDA Zone | Typical Planting Window |
| Zones 3–4 | Mid-September to early October |
| Zones 5–6 | Late September to late October |
| Zone 7 | October to early November |
| Zones 8–9 | Late October to December |
| Zone 10 | November to December (chill cloves first) |
These are general ranges, not guarantees. Treat them as a starting point for when to plant garlic, then fine-tune with your local frost date and the weather that year.
Tip 3: Pick a Variety That Suits Your Climate
Hardneck types tend to taste hotter and more “garlicky,” and they send up an edible flower stalk called a scape, according to the University of Kentucky. Softneck types rarely produce flower stems and tend to form larger bulbs, per Oregon State. Hardneck generally suits colder winters, while softneck is better in milder areas. Variety won’t change when to plant garlic by much, but it helps you choose a type that survives your winter.
Tip 4: Buy Seed Garlic, Not Grocery Store Bulbs
Penn State Extension says grocery store cloves are not a good choice for planting. Kentucky adds that they may not suit your area and are often treated for longer shelf life. Buy certified seed garlic from a nursery or seed company instead.
Tip 5: Prepare Loose, Well-Drained Soil
Garlic wants full sun and well-drained, slightly acidic soil rich in organic matter. Kentucky recommends a pH of 6.5 to 7. Mix in compost before planting, and avoid planting garlic where onions or other alliums grew recently, since Penn State suggests at least two years between plantings. Soil drainage is easier in a bed, so our guide on how to build a raised garden bed is a good place to start.
Tip 6: Plant Cloves Pointy End Up at the Right Depth
Break the bulb apart just before planting and leave the papery skins on. Set each clove about 2 inches deep and 4 inches apart, tip facing up, as Wisconsin Extension advises. Water lightly after planting, and keep the bed evenly moist without soaking it. Our post on how often garden plants should be watered covers the basics.
Tip 7: Mulch After Planting
Cover the bed with 3 to 4 inches of straw. Mulch insulates the soil, protects new roots from temperature swings, and keeps weeds down through winter.
Is It Too Late to Plant Garlic?
Not always. Ideally you’d know when to plant garlic well ahead of time, but if the ground is still workable, planting late is better than skipping it. Expect smaller bulbs, mulch well, and plant as soon as you can. If the soil is already frozen solid, wait for spring.
Can You Plant Garlic in Spring?
Yes, with a catch. Illinois Extension says early spring planting is possible, but cloves must first be refrigerated for about eight weeks to meet their chilling needs. Bulbs from spring planting are usually smaller than fall-planted ones.
When Will Your Garlic Be Ready?
Garlic planted in fall is harvested the following summer, as the University of Kentucky notes. Your planting date shapes your harvest date, so knowing when to plant garlic helps you plan the whole season. Watch the lower leaves. When several turn brown, dig one bulb to check its size.
Final Thoughts
Getting when to plant garlic right mostly comes down to counting back from your frost date and choosing good seed garlic. Do that, prepare your soil, mulch, and wait. New to growing food? Start with our vegetable garden for beginners guide or these gardening tips for beginners.
FAQs About Planting Garlic
When to plant garlic in zone 5 or zone 6?
In zones 5 and 6, when to plant garlic usually means late September through October, about four to six weeks before the ground freezes.
Can you plant garlic in October?
Yes. October is prime planting time across much of the U.S., especially in zones 5 through 7.
How deep should you plant garlic cloves?
About 2 inches deep, pointy end up, roughly 4 inches apart.
Can you plant garlic from the grocery store?
You can, but it usually performs worse than seed garlic. Store bulbs may not suit your climate and are often treated for shelf life.
How long does garlic take to grow?
Fall-planted garlic is typically ready the following summer.
Sources
University of Illinois Extension: Growing Garlic
University of Minnesota Extension: Last chance to plant garlic
University of Wisconsin Extension: Garlic – Fall is the Time to Plant
Oregon State University Extension: Fall is the best time to plant garlic