When to Plant Beets in Arizona
Published: April 24, 2026
Arizona gardeners in Zone 9b enjoy an extended 50-week growing season for beet. Cool-season crops like beet do best in fall, winter, and early spring in Arizona — the hot summers bolt these plants before they can be harvested. This guide gives exact dates for Arizona based on your local frost calendar.
Beet Planting Dates for Arizona
| Start seeds indoors | Year-round |
| Last frost (average) | January 15 |
| Direct sow outdoors | December 18–28 |
| Expect first harvest | February 6 – February 26 |
| Fall crop start | November 5–15 |
| Fall harvest | December 25 |
| First fall frost (average) | December 31 |
Dates above assume Zone 9b, the most common zone in Arizona. Gardeners in cooler San Tan Valley (Zone 7b) plant 1–2 weeks later; warmer Tucson (Zone 9a) can plant 1–2 weeks earlier.
⚠ Direct sow beets 3–4 weeks before last frost. Each beet seed cluster contains 2–3 seeds — thin to 3 inches. Succession plant every 3 weeks.
Growing Beets in Arizona's Climate
Arizona's warm Zone 9b climate makes beet a fall, winter, and early spring crop rather than a summer one. The cool-season window runs roughly October through April in Arizona — plant outside this window and the beet will bolt (send up a flower stalk and turn bitter) before it produces a harvestable crop.
Succession planting stretches the beet harvest window. Sow small amounts every two weeks from October through February — you will have staggered harvests rather than a single wave to process all at once. Bolt-resistant varieties extend the usable window an extra three to four weeks into warming weather.
Common beet pests to watch for in Arizona include Leaf Miner and Flea Beetle. The first line of defense is companion planting: Onion and Garlic 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.
Beet Garden Calendar for Arizona
| Month | Task | Notes |
|---|---|---|
| January | — | Off-season |
| February | First harvest window opens | Beet begins producing 50–70 days after transplant |
| March | — | Off-season |
| April | — | Off-season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Off-season |
| July | — | Off-season |
| August | — | Off-season |
| September | — | Off-season |
| October | — | Off-season |
| November | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| December | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 3 inches apart |
Beet Growing Tips for Arizona Gardeners
- •Soak beet seeds 4 hours before planting to soften the tough seed cluster and improve germination rates.
- •Thin seedlings to 3 inches apart — crowded plants produce tiny woody roots rather than full-sized beets.
- •Arizona's cool-season beet plants best in October, November, and December for winter and early spring harvest. Spring plantings bolt before producing a harvestable crop.
- •Use thinnings as baby greens in salads; beet greens are more nutritious than the roots.
Companion Planting for Beets in Arizona
In Arizona's warm climate, planting beet with Onion and Garlic helps deter pests and improve soil. Avoid planting near Pole Bean and Mustard, which inhibit beet growth through root chemistry or shared pest pressure. See the full beet companion planting guide for the complete list.
Beets Planting Dates by City in Arizona
Top cities in Arizona — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant beet in Arizona?
In Arizona (Zone 9b), start beet seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of January 15.
What is the last frost date in Arizona?
Arizona's average last frost date is January 15 in the state's most common Zone 9b. 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 beet year-round in Arizona?
beet is a cool-season crop in Arizona, 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 beet varieties grow best in Arizona?
For Arizona's Zone 9b, consult a local nursery or extension office for beets variety recommendations.
When do I start beet seeds indoors in Arizona?
Beet does not need indoor starting in Arizona — direct sow around December 18–28 once soil reaches 40°F. Indoor starting is not recommended for this crop because beet transplants poorly.