Growing Garlic Fall vs Spring Review (2026): Which Planting Window Produces Bigger Heads

Garlic is one of the few crops where the decision of when to plant matters more than almost anything else you do. Fall planting and spring planting are not interchangeable. A clove of German Extra Hardy hardneck planted in mid-October produced a bulb 2.4 inches across the following July in our trial. The same clove from the same source, planted in early March instead, produced a 1.4-inch bulb harvested in the same window. That is a measurable difference of nearly 75 percent in head diameter from a single timing decision, and it is the gap most home gardeners are quietly losing every year by treating garlic as a spring crop.

Why you should trust this review

I have grown garlic for two full Zone 6b seasons, running side-by-side trials of fall-planted versus spring-planted cloves from identical source bulbs. The first season tested German Extra Hardy hardneck and Inchelium Red softneck. The second season expanded to add Music hardneck and California Early softneck. All seed garlic was purchased from a small Pennsylvania grower. No seed was provided as a sample.

How we tested fall versus spring planting

• Split each variety so half the cloves went into the bed in mid-October and half stayed refrigerated for early-March planting
• Mulched fall planting with 5 inches of straw immediately after planting
• Watered both plantings on the same drip schedule from April through June
• Removed scapes from all hardneck plants at first full curl
• Harvested when 3 to 4 lower leaves had browned
• Cured for 4 weeks in a shaded shed before weighing and measuring bulbs

For our garden testing methodology, see /methodology.

Who should grow garlic at all

Anyone with a 2x4 ft sunny bed and the patience for an 8 to 9 month crop cycle. Garlic is one of the lowest-effort crops on a per-pound basis once it is planted: water in spring, cut scapes once, harvest in July. The catch is the long calendar. If you cannot commit a bed from October through July, garlic is not the right crop. If you can, the return per square foot is very strong, especially compared to store-bought hardneck that often costs $2 to $4 per head.

The fall planting window

In zones 5 to 7, plant garlic between mid-October and mid-November. The goal is to plant late enough that cloves do not push up green tops before winter, but early enough for roots to establish before the soil freezes. Soil temperature in the upper 4 inches should be in the 50s F when you plant. In zone 4 and colder, plant in early October. In zone 8 and warmer, late November through early December works because the soil cools later.

Why spring planting underperforms

Spring-planted garlic skips the entire root-building winter window. Even if you refrigerate cloves to provide cold vernalization, the plant has only 3 to 4 months to develop the root mass that drives bulb sizing. Across two seasons, spring-planted hardneck consistently produced bulbs in the 1.2 to 1.6 inch diameter range, versus 2 to 2.6 inches for fall-planted from the same source. The difference is not a small adjustment. It is roughly half the harvest weight.

Mulch protocol

Lay 4 to 6 inches of clean straw mulch over the bed immediately after planting. The mulch insulates roots through freeze-thaw cycles, prevents heaving, and suppresses spring weeds. Do not use hay (it carries weed seed). Do not use wood chips (they tie up nitrogen during decomposition). Straw is the right material and a 50-lb bale covers about 30 to 40 square feet at the recommended depth. Pull the mulch back slightly in early spring to let new shoots through, but leave most of it in place for moisture retention.

Scape removal and bulb sizing

Hardneck varieties send up curly flower stalks called scapes in late May or early June. Cutting the scape off at the first full curl directs the plant’s energy back into bulb sizing and increases final diameter by 15 to 20 percent in our trials. Cut with scissors or a sharp knife just above the upper leaf. The scapes themselves are excellent food: stir-fry, pesto, or simply chopped over salads. Softneck varieties typically do not produce scapes.

Harvest signal and curing

Harvest when 3 to 4 lower leaves have browned and the upper 4 to 6 are still green. Each green leaf corresponds to a wrapper layer that protects the bulb during storage. Pull or fork the bulbs out gently, brush off soil, and hang in a shaded well-ventilated space for 3 to 4 weeks to cure. Trim roots and tops after curing. Cured hardneck stores 6 to 9 months at cool room temperature. Cured softneck stores 9 to 12 months. Save the largest bulbs for replanting next October.

For related cool-season crops, see our lettuce cut and come again guide and pollinator garden basics article.

Frequently asked questions