Arizona planting calendar

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

Arizona is mostly USDA zone 9a (range 4b-10b). Dates below are derived from garlic's frost tolerance and Arizona's frost window — not generic national averages.

Garlic planting timetable for Arizona

Stage	When in Arizona	Anchor
Plant cloves outdoors	late October — early November (October 31)	~35 days before Arizona's first fall frost (early December (low desert))
First harvest	early July 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 Arizona's climate shifts the garlic dates

Arizona's first fall frost averages early December (low desert), which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Arizona ranges from snowy mountain forest to frost-free low desert. In the desert, summer heat is the binding constraint and winter is the prime growing 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 high country around Flagstaff (zone 4b-6a) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Arizona

the high country around Flagstaff (zone 4b-6a) should plant at the earlier end of the window and grow hardneck types; the low desert around Yuma and Phoenix (zone 10b) can plant later and lean on softneck varieties.

Phoenix — USDA zone 10a
Tucson — USDA zone 9b
Flagstaff — USDA zone 6a
Yuma — USDA zone 10b
Mesa — USDA zone 10a

What else to plant in Arizona 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 Arizona?

In Arizona (mostly USDA zone 9a), plant garlic cloves outdoors around late October — early November — roughly 35 days before the first fall frost (early December (low desert)). Cloves root through autumn, overwinter, then bulb up by early July 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 Arizona?

Most of Arizona sits in USDA hardiness zone 9a, with the state spanning roughly 4b-10b from the high country around Flagstaff (zone 4b-6a) to the low desert around Yuma and Phoenix (zone 10b). The last spring frost averages mid-February (low desert) and the first fall frost early December (low desert).

Can you grow garlic in Arizona?

Yes. Arizona's dominant zone 9a 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 Arizona?

What else can I plant in Arizona 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.