When to Plant Garlic (Fall Timing by Zone)

Garlic is a fall crop you harvest the next summer. You plant it in cool weather, it grows roots underground over winter, then it bulks up and finishes in early summer. Get the timing right and the rest is easy.

This post covers timing only: when to plant by zone, and which type to plant for your winter. For the full how-to, depth, clove count, and bed-size math, see the step-by-step guide linked below.

When to plant garlic by exact USDA zone

The target is the same everywhere: get cloves in the ground early enough to grow roots, but late enough that they do not push leaves up before winter. Penn State Extension puts that at a good three weeks before the ground freezes. UMN Extension and Wisconsin Extension both time it to within a week or two after the first killing frost.

Colder zones freeze sooner, so they plant sooner. The table below breaks that out zone by zone instead of lumping regions together, since zones 5 through 8 cover a lot of gardeners and each one has its own first-frost timing.

Zone ranges are a starting point — for an exact date, look up your first frost date by ZIP code instead of guessing from your zone.

A word on how this table was built. Most university extension pages give a planting window for their own state or region, not a table sorted by USDA zone number. Minnesota and Wisconsin sit in zones 3 to 5 and both point to right after the first killing frost, so those states set the zone 3 and 4 rows. Iowa State Extension covers a state that spans zones 4b to 5b, so its guidance anchors zone 5 and overlaps into zone 6. Penn State sits mostly in zones 6 and 7 and gives the "three weeks before the ground freezes" rule those rows use. Oregon State Extension covers the mild, wet-winter zones 8 and 9 on the West Coast, where frost arrives much later than it does at the same zone number inland. Illinois Extension calls mid-October about perfect for central Illinois, a zone-6 benchmark that lines up with the table above.

Treat these as starting points, not deadlines. Watch your own first-frost date and ground temperature, since a zone number is an average and your yard might run a week or two either side of it.

Hardneck or softneck: match it to your winter

Garlic comes in two families, and the right one depends on how cold your winter gets and what you want out of the harvest.

Hardneck sends up a stiff central stalk and a curly flower stem called a scape. Wisconsin Extension says hardneck types perform best where winters are long and the season of growth is relatively short. That scape is a bonus crop of its own, cut in late spring and edible sauteed or turned into pesto. UMN Extension groups Rocambole, Purple Stripe, and Porcelain among the hardneck types.

Softneck has no stalk, so all its energy goes into the bulb instead of a scape. It stores longer than hardneck and braids well, since the leaves stay soft after curing. Wisconsin Extension says softneck types are better adapted to areas with long seasons and mild winters. UMN Extension lists Artichoke and Silverskin as softneck types.

Planting timing itself does not shift much between the two types within the same zone. Both go in the ground on the same fall schedule for your USDA zone. The type choice is about which garlic survives and performs well in your climate, not about planting earlier or later.

So cold zones (3 to 6) lean hardneck, since it handles a hard freeze and needs the cold to develop properly. Mild zones (8 to 9) lean softneck, since it is bred for places without a deep winter. Zones 6 to 7 sit in the overlap and can grow both well, so pick based on whether you want the scape and the bigger, fewer cloves of hardneck, or the longer shelf life and braid-ready stalks of softneck.

How to plant garlic

You plant the cloves, not the whole bulb. Each clove becomes one new head of garlic the next summer.

Here is the order of work:

1. Break the bulb into cloves just before planting. UMN Extension says separate the cloves just before planting and pick the largest ones, since big cloves make big bulbs. Do not crack bulbs open days ahead. Illinois Extension warns early separation has been shown to reduce mature bulb size.
2. Set each clove pointy end up. The flat base grows roots, the point grows the shoot. Wisconsin Extension says place cloves pointed side up, 2 to 3 inches deep. A clove planted upside down grows a bent, misshapen bulb.
3. Space them 4 to 6 inches apart. Penn State says 4 to 8 inches between plants. Wisconsin lists about 6 inches apart. Crowded garlic stays small.
4. Cover and water in. Firm the soil over the cloves and water once to settle them.

For depth, leave the base of the clove 2 to 3 inches below the surface, per UMN Extension. Penn State sets the floor at at least 2 inches deep.

Fall vs spring planting: the honest trade-off

Fall is the default for a reason. Garlic needs a stretch of cold to split a single clove into a full head. Without it, you get one round, undivided bulb instead of a segmented one.

You can plant in spring, but the bulbs come out smaller. UMN Extension is blunt: garlic planted in spring without a proper cold treatment produces weak shoots and poorly developed bulbs. If a hard winter or a late seed-garlic order forces your hand, plant as early as the ground can be worked and choose a softneck artichoke type, which UMN calls the most suitable for spring.

For most US gardeners, fall planting is the move. Spring is the backup, not the plan.

Get the spacing right before you plant

Spacing is where garlic yield is won or lost. At 4 to 6 inches apart, each clove has room to size up into a full head. Pack them tighter and every bulb stays small.

Work out how many cloves your bed holds before you order seed garlic. The plant spacing chart lists garlic alongside onions and other crops, and the plant spacing calculator counts how many fit your exact bed. For the full spacing breakdown by method, see how far apart to plant garlic.

Garlic shares a rhythm with the rest of the allium bed. The same fall-plant, summer-pull cycle drives when to harvest onions, and the payoff for this planting is covered in when to harvest garlic. Planning what shares the bed? Garlic companion plants covers what to plant alongside it and what to keep away.

Your next step

Plant garlic in fall, 3 to 6 weeks before the ground freezes, somewhere in the mid-September to November window for most US zones. Check the zone table above for your exact window, break the bulb into cloves the day you plant, set each one pointy end up 2 inches deep and 4 to 6 inches apart, then mulch with 3 to 4 inches of straw.

Ready to lay out the bed? Open the plant spacing calculator and set garlic at 6 inches so every clove has room to bulk up, or read how to plant garlic for the full step-by-step. Buying seed garlic by the pound and need the clove count? The garlic planting calculator converts pounds into cloves for your bed. Planting spring bulbs on the same fall schedule? When to plant tulip bulbs covers the soil-temperature trigger for those.