Delaware planting calendar

When to plant garlic in Delaware — sow, transplant & harvest dates

Delaware is mostly USDA zone 7b (range 7a-8a). Dates below are derived from garlic's frost tolerance and Delaware's frost window — not generic national averages.

Garlic planting timetable for Delaware

Stage	When in Delaware	Anchor
Plant cloves outdoors	early September — late September (September 20)	~35 days before Delaware's first fall frost (late October)
First harvest	mid-May the following year	~240 days from autumn planting

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Delaware's climate shifts the garlic dates

Delaware's first fall frost averages late October, which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Delaware is small and mild, moderated by the Atlantic and Delaware Bay, with a long, productive mid-Atlantic season.

Garlic is the unusual one — plant cloves in autumn (4-6 weeks before the first hard fall frost) so they put down roots before winter, then break dormancy in spring and bulb up over the long days of early summer. Cold-winter zones grow hardneck varieties; mild-winter zones do better with softneck.

Frost-risk note

Get cloves in before the ground freezes solid; in the northern Piedmont near Wilmington (zone 7a) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Delaware

the northern Piedmont near Wilmington (zone 7a) should plant at the earlier end of the window and grow hardneck types; the Atlantic coast and lower Delmarva (zone 8a) can plant later and lean on softneck varieties.

Wilmington — USDA zone 7b
Dover — USDA zone 7b
Newark — USDA zone 7b
Rehoboth Beach — USDA zone 8a

What else to plant in Delaware around then

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: Soil 10-15 °C (50-60 °F) at planting.
Spacing: 4-6 inches (10-15 cm) between plants.
Days to harvest: ~240 days from autumn planting.

Frequently asked questions

When is the best time to plant garlic in Delaware?

In Delaware (mostly USDA zone 7b), plant garlic cloves outdoors around early September — late September — roughly 35 days before the first fall frost (late October). Cloves root through autumn, overwinter, then bulb up by mid-May next year. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

What USDA zone is Delaware?

Most of Delaware sits in USDA hardiness zone 7b, with the state spanning roughly 7a-8a from the northern Piedmont near Wilmington (zone 7a) to the Atlantic coast and lower Delmarva (zone 8a). The last spring frost averages mid-April and the first fall frost late October.

Can you grow garlic in Delaware?

Yes. Delaware's dominant zone 7b supports garlic — the key is timing. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

Does the planting date change across Delaware?

What else can I plant in Delaware around the same time?

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.