Arizona planting calendar

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

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

Beets planting timetable for Arizona

Stage	When in Arizona	Anchor
Direct-sow / set out (main)	October — February	Grown through the cool season, not summer
Shoulder sowing	September and again late February	Avoid germinating into summer heat
First harvest	~58 days after sowing (late autumn through spring)	58-day crop

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 beets dates

Arizona flips the calendar: its winter is the productive beets season while northern states are frozen, and its summer is the off-season. 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.

Beets are direct-sown only — their corky seed clusters are multi-seeded and the taproot does not recover well from transplanting. Sow 2-4 weeks before the last spring frost in loose, well-drained soil; seedlings tolerate light frost once established. Thin to 3-4 inches to avoid fanged or stunted roots. In zones 8 and warmer, a fall sowing (8-10 weeks before first fall frost) often outperforms the spring crop.

Frost-risk note

Light frost in the high country around Flagstaff (zone 4b-6a) only nips the outer leaves — heat, not cold, ends the crop.

Regional variation within Arizona

the low desert around Yuma and Phoenix (zone 10b) can sow earliest in autumn and latest into late winter; the high country around Flagstaff (zone 4b-6a) has a slightly shorter, frost-bracketed window.

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 cool window suits other greens, brassicas, peas, carrots, and radishes — fill beds October through February.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: 10-29 °C (50-85 °F).
Spacing: 3-4 inches (8-10 cm) between plants.
Days to harvest: ~58 days from planting out.

Frequently asked questions

When is the best time to plant beets in Arizona?

In Arizona (mostly USDA zone 9a), grow beets as a cool-season crop: direct-sow from October through February, harvest ~58 days later, and skip summer entirely — heat above 24 °C bolts it. Beets are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

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 beets in Arizona?

Yes. Arizona's dominant zone 9a supports beets — the key is timing. Beets are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

Does the planting date change across Arizona?

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

The same cool window suits other greens, brassicas, peas, carrots, and radishes — fill beds October through February.

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.