When to Plant Scallions in Arizona (2026 Guide)
Scallions, often referred to as green onions or bunching onions, are a fantastic crop for Arizona gardeners looking to maximize their harvests. With the average last spring frost date varying across zones, notably falling on February 8 in Zone 8b–9a, starting your scallion seeds at the right time is crucial. These versatile vegetables are harvested whole, ensuring that you can enjoy fresh culinary delights throughout the growing season.
In Arizona, the climate allows for a staggered planting schedule, making it easy to have a continuous supply of scallions from spring through fall. In Zone 7b–8a, the median last spring frost occurs on February 16, while in cooler areas such as Prescott (Zone 5b), it may not be until May 4. Understanding these local frost dates helps achieve optimal plant growth and yields.
To get the most from your garden, it's essential to leverage the growing season effectively. With a frost-free season stretching nearly 300 days in warmer regions, scallions can thrive when planted at the right time. By applying techniques like succession sowing every 3–4 weeks, you ensure a steady harvest and keep your garden productive, even in Arizona's varying climate.
Planting Schedule by USDA Zone in Arizona
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 8b–9a | Start January 10 – January 24, ~6–8 weeks before February 8 | Transplant outdoors from February 9 – March 1 | Direct sow from February 9 – November 30 | Harvest from May 1 – December 15 |
| Zone 7b–8a | Start January 31 – February 14, ~6–8 weeks before February 16 | Transplant outdoors from February 17 – March 10 | Direct sow from February 17 – November 1 | Harvest from May 15 – December 1 |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 4 | Transplant outdoors from May 5 – May 20 | Direct sow from May 5 – September 1 | Harvest from July 15 – October 15 |
Scallions Planting Windows in Arizona
- Indoor start: For Arizona's warmer zones, begin indoor sowing of scallions between January 10 and February 14, depending on your specific hardiness zone.
- Transplant outdoors: In most areas of Arizona, transplant outdoors from February 9 to March 10 for optimal growth.
- Harvest: You can expect to harvest scallions in Arizona from as early as May 1 up until December 15, depending on your planting schedule and zone.
Common Mistakes Growing Scallions in Arizona
- One common error new Arizona gardeners make is planting scallions too close to summer's heat. Scallions thrive in cool weather, so timing your planting right can avoid bolting and lower yields.
- Using poor-quality soil is another common mistake. Arizona's alkaline soil can affect nutrient absorption, so enriching it with compost and organic matter is crucial for healthy scallion growth.
- Failing to consider local microclimates can impact your scallion planting schedule. Areas with late frost pockets can jeopardize early transplants or sowings if not carefully timed.
- Many gardeners in Arizona underestimate the importance of consistent watering, especially during dry spells. Scallions need moisture to develop properly, and neglecting them can lead to stunted growth.
- Some growers confuse scallions with bulb onions. Unlike bulb onions, scallions are non-bulbing, so they can be planted more flexibly throughout the cool season without the same day-length concerns.
Frequently Asked Questions
What if I’m in a cold pocket of Arizona?
If you’re in a cold pocket, it's important to adjust your planting dates. Wait until you're past the average last frost date to ensure your scallions have the best chance to thrive. You might need to use row covers for added protection.
Can I still plant scallions in May?
Yes, you can still plant scallions in May, especially in warmer zones (8b–9a) of Arizona. Just be aware that their growth might slow down as temperatures increase, and consider giving them shade during the hottest parts of the day.
How often should I water my scallions?
Scallions need consistent moisture, so aim to water them deeply once a week, ensuring the soil remains evenly moist. Monitor your garden's conditions, especially during dry spells in Arizona, as scallions have shallow roots.
Can I harvest scallions all summer long?
Yes, if you plant scallions every 3–4 weeks, you can enjoy continuous harvests from late spring through the summer. Just ensure you keep them well watered during the hotter months for optimal growth.
What is the best soil type for scallions?
Scallions thrive in well-draining, rich soil with a lot of organic matter. Since Arizona's soil can be alkaline, consider mixing in compost and other organic materials to enhance moisture retention and nutrient availability.
Keep Learning
City guides in Arizona
Other crops in Arizona
Typical fall sowing window for Scallions in Arizona: September 18 – October 9.