When to Plant Beans in Arizona
Published: April 24, 2026
Arizona gardeners in Zone 9b enjoy an extended 50-week growing season for bean. Warm-climate gardeners can grow two bean crops — a spring planting and a fall planting — with summer heat as the main challenge to work around. This guide gives exact dates for Arizona based on your local frost calendar.
Bean Planting Dates for Arizona
| Start seeds indoors | Year-round |
| Last frost (average) | January 15 |
| Direct sow outdoors | January 22–February 1 |
| Expect first harvest | March 13 – March 28 |
| Fall crop start | October 22–November 1 |
| Fall harvest | December 11 |
| 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 beans after last frost when soil reaches 60°F. Never start indoors — beans resent transplanting. Succession plant every 2–3 weeks for continuous harvest.
Growing Beans in Arizona's Climate
Arizona's warm Zone 9b climate gives bean more than enough heat — in fact, peak summer heat (95°F+) can shut down fruit set entirely. The solution most Arizona gardeners use is a two-season approach: a spring crop planted early, a harvest break during peak summer, and a fall crop planted July through August for October and November harvest.
Variety selection matters more in warm climates than most gardeners realize. Choose heat-tolerant varieties bred for Arizona-like conditions — local extension offices and nurseries stock these specifically. Afternoon shade cloth during July and August can be the difference between a working fall crop and total flower drop.
Common bean pests to watch for in Arizona include Mexican Bean Beetle and Aphid. The first line of defense is companion planting: Corn and Cucumber 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.
Bean Garden Calendar for Arizona
| Month | Task | Notes |
|---|---|---|
| January | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 4 inches apart |
| February | — | Off-season |
| March | First harvest window opens | Bean begins producing 50–65 days after transplant |
| April | — | Off-season |
| May ← | — | Off-season |
| June | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Start fall crop seeds | Fall transplants go in 10 weeks before first frost |
| August | — | Off-season |
| September | — | Off-season |
| October | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| November | — | Off-season |
| December | First frost approaches | Harvest remaining bean; cover plants on frost nights |
Bean Growing Tips for Arizona Gardeners
- •Inoculate bean seeds with rhizobium bacteria before planting in new garden soil — boosts nitrogen fixation and yields.
- •Plant bush beans every 2–3 weeks through midsummer for a continuous harvest from July to first frost.
- •Arizona's summer heat shuts down bean flowering at 95°F+. Choose heat-tolerant varieties and use shade cloth from mid-June through August to preserve fruit set.
- •Arizona's fall crop is often more productive than spring — plant transplants in July after the worst heat, for October and November harvest as temperatures cool.
- •Pole beans produce for 6–8 weeks from a single planting; plant once, harvest all season.
Companion Planting for Beans in Arizona
In Arizona's warm climate, planting bean with Corn and Cucumber helps deter pests and improve soil. Avoid planting near Onion and Garlic, which inhibit bean growth through root chemistry or shared pest pressure. See the full bean companion planting guide for the complete list.
Beans 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 bean in Arizona?
In Arizona (Zone 9b), start bean 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 bean year-round in Arizona?
Not year-round — Arizona's cold season stops bean production. The bean season runs January 15 to December 31, roughly 50 weeks. A fall crop extends harvest into late autumn.
What bean varieties grow best in Arizona?
For Arizona's Zone 9b, consult a local nursery or extension office for beans variety recommendations.
When do I start bean seeds indoors in Arizona?
Bean does not need indoor starting in Arizona — direct sow around January 22–February 1 once soil reaches 60°F. Indoor starting is not recommended for this crop because bean transplants poorly.