🧅 Can I Plant Green Onion in Tucson, AZ?

2026 planting guide for Zone 9b · Last frost ~February 5 · Growing season ~309 days

✅ YES — Good temps, but watch for heat — highs near 105°F

Temperature conditions are suitable for Green Onion. Highs near 105°F are on the warm side — make sure plants have plenty of water. The season is running warmer than normal, which has opened this window earlier than usual.

Planting window: May 20 – Jun 3
Good to go — plant now while conditions are right.
Live result based on current forecast for Tucson, AZ · Updates every 6 hours
USDA Zone
9b
Last Spring Frost
~February 5
First Fall Frost
December 10
Growing Season
~309 days
Ideal Temp for Green Onion
50–80°F
Frost Risk
✅ Tolerant

Growing Green Onion in Tucson

Tucson's Zone 9b Sonoran Desert climate means most gardening happens outside of peak summer (June–August), when temperatures routinely exceed 100°F. Spring (February–May) and fall (September–November) are the primary growing windows. Cool-season crops do beautifully in Tucson's mild winters, and the monsoon rains from July through September can extend the warm-season growing period.

In Tucson (last frost around February 5), green onion can go out around January — approximately 4 weeks before the last expected frost, making it an early-season opportunity. Starting seeds indoors 8 weeks before the last frost date gives you a significant head start.

Green Onion thrives between 50°F and 80°F. It tolerates temperatures as low as 35°F, making it a candidate for early spring planting before the last frost date. Expect 60–80 days from transplant to first harvest. Easy and fast. Direct sow in early spring or fall. Harvest young.

Frequently Asked Questions

When can I plant green onion in Tucson, AZ?

In Tucson (last frost around February 5), green onion can go out around January — approximately 4 weeks before the last expected frost, making it an early-season opportunity. For best results, start seeds indoors 8 weeks before that — giving you strong transplants ready to go out at the right time.

What is the USDA hardiness zone for Tucson?

Tucson, AZ is in USDA Plant Hardiness Zone 9b. The last expected spring frost is around February 5, and the first fall frost arrives around December 10. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant green onion outside in Tucson right now?

That depends on the current weather forecast. Green Onion needs temperatures above 35°F (ideally 50–80°F) to thrive. CanIPlant checks your real 7-day forecast and any active frost alerts to give you a live YES, NO, or WAIT answer — just enter your ZIP code.

Can I grow green onion in Tucson 2026?

Yes — Green Onion grows well in Tucson, AZ. With a Zone 9b climate and a growing season of ~309 days, Tucson is well-suited for warm-season crops like green onion. As a frost-tolerant crop, green onion can even go out a few weeks before the last frost date.

Grow Green Onion in Other Cities

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