When to Plant Garlic in Delaware
Published: April 21, 2026
Delaware gardeners in Zone 6a grow garlic on the opposite calendar from most vegetables: plant cloves in October or November and harvest the following summer. This guide provides Delaware-specific planting and harvest dates and the state's specific cold-hardening needs.
Garlic Planting Dates for Delaware
| Last frost (average) | March 30 |
| Direct sow outdoors | October–November (plant cloves) |
| Expect first harvest | June (following year) – July (following year) |
| First fall frost (average) | November 1 |
⚠ PLANTING SEASON IS OPPOSITE: Plant garlic cloves in fall (October–November) for harvest the following summer (June–July). This is unlike any other common vegetable.
Growing Garlic in Delaware's Climate
Delaware's moderate Zone 6a climate is well-suited to garlic with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your garlic harvest significantly in Delaware. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common garlic pests to watch for in Delaware include Thrips and White Rot. The first line of defense is companion planting: Tomato and Rose planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Garlic Garden Calendar for Delaware
| Month | Task | Notes |
|---|---|---|
| January | — | |
| February | — | |
| March | Remove mulch | Pull back mulch as green shoots emerge |
| April | — | |
| May ← | Side-dress with nitrogen | Feed once as bulbs begin sizing |
| June | Remove scapes; monitor | Snap off curling flower stalks on hardneck varieties |
| July | Harvest | Harvest when bottom 3–4 leaves turn brown |
| August | Cure harvested bulbs | Hang in warm, airy, shaded spot for 3–4 weeks before storage |
| September | — | |
| October | Plant garlic cloves | Break bulbs into cloves; plant pointed end up, 2 inches deep |
| November | Plant (late) + mulch | Last chance to plant before ground freezes; mulch 3–4 inches straw |
| December | — |
Garlic Growing Tips for Delaware Gardeners
- •Plant individual cloves in October–November, pointed end up, 2 inches deep, 6 inches apart.
- •Mulch with 3–4 inches of straw after the first hard freeze to insulate through winter.
- •Delaware's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Remove garlic scapes (the curling flower stalks) in June from hardneck varieties to redirect energy to the bulb.
Companion Planting for Garlic in Delaware
In Delaware's moderate climate, planting garlic with Tomato and Rose helps deter pests and improve soil. Avoid planting near Bean and Pea, which inhibit garlic growth through root chemistry or shared pest pressure. See the full garlic companion planting guide for the complete list.
Garlic Planting Dates by City in Delaware
Top cities in Delaware — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant garlic in Delaware?
Plant garlic cloves in Delaware during October or November, 4 to 6 weeks before the ground freezes. Harvest the following July. This is the opposite calendar from most vegetables.
What is the last frost date in Delaware?
Delaware's average last frost date is March 30 in the state's most common Zone 6a. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow garlic year-round in Delaware?
garlic is a cool-season crop in Delaware, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What garlic varieties grow best in Delaware?
For Delaware's Zone 6a, A hardneck-softneck mix gives you storage (softneck) and flavor complexity (hardneck).
When do I start garlic seeds indoors in Delaware?
Garlic does not need indoor starting in Delaware — direct sow around October–November (plant cloves) once soil reaches 50°F. Indoor starting is not recommended for this crop because garlic transplants poorly.