Missouri planting calendar

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

Missouri is mostly USDA zone 6b (range 5b-7a). Dates below are derived from garlic's frost tolerance and Missouri's frost window — not generic national averages.

Garlic planting timetable for Missouri

Stage	When in Missouri	Anchor
Plant cloves outdoors	late August — mid-September (September 10)	~35 days before Missouri's first fall frost (mid-October)
First harvest	early 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 Missouri's climate shifts the garlic dates

Missouri's first fall frost averages mid-October, which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Missouri has a humid continental climate with hot summers and a southeastern Bootheel that gardens nearly a zone warmer than the north.

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 counties near Iowa (zone 5b) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Missouri

the northern counties near Iowa (zone 5b) should plant at the earlier end of the window and grow hardneck types; the Bootheel in the southeast (zone 7a) can plant later and lean on softneck varieties.

Kansas City — USDA zone 6b
St. Louis — USDA zone 7a
Springfield — USDA zone 7a
Columbia — USDA zone 6b

What else to plant in Missouri 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 Missouri?

In Missouri (mostly USDA zone 6b), plant garlic cloves outdoors around late August — mid-September — roughly 35 days before the first fall frost (mid-October). Cloves root through autumn, overwinter, then bulb up by early 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 Missouri?

Most of Missouri sits in USDA hardiness zone 6b, with the state spanning roughly 5b-7a from the northern counties near Iowa (zone 5b) to the Bootheel in the southeast (zone 7a). The last spring frost averages mid-April and the first fall frost mid-October.

Can you grow garlic in Missouri?

Yes. Missouri's dominant zone 6b 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 Missouri?

What else can I plant in Missouri 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.