When to Plant Scallions in California (2026 Guide)
Growing scallions in California offers diverse options thanks to the state's varied climate and frost dates. Depending on your specific location within the state, the median last spring frost can be as late as February 26 in Zone 7b–8a or as early as January 11 in Zone 9b. This variety allows gardeners to maximize their growing seasons for these versatile greens.
Scallions, also known as green onions, thrive in cooler temperatures and are exceptionally productive, allowing gardeners to enjoy continuous harvests from the spring through the fall. For instance, in areas like Sacramento, where the frost-free season is approximately 274 days, you can enjoy scallions from early plantings right through late autumn. Timing is crucial, and understanding your zone's frost events helps ensure successful crops.
In California, gardening often comes with unique challenges, such as coastal fog and occasional late spring snow, which can affect when you plant. However, with proper planning around the median frost dates—like the January 31 last frost in Zone 8b–9a—scallions can flourish and be ready for harvest in just 60 to 70 days. Whether you're near Los Angeles or San Diego, there's ample opportunity to grow this rewarding crop.
Planting Schedule by USDA Zone in California
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 8b–9a | Start January 31 – February 15, ~6–8 weeks before April 10 | Transplant outdoors March 15 – April 1, after frost danger has passed | Direct sow March 15 – April 15, ensuring soil is workable | Harvest from June 1 – October 15 for multiple cuttings |
| Zone 7b–8a | Start February 26 – March 12, ~6–8 weeks before May 1 | Transplant outdoors April 1 – April 15, after last frost | Direct sow April 1 – May 1 for late spring growth | Harvest from June 15 – October 1 for optimal yield |
| Zone 9b | Start January 11 – January 25, ~6–8 weeks before February 15 | Transplant outdoors February 15 – March 1, suitable for mild winters | Direct sow February 1 – March 15 for fresh spring scallions | Harvest from March 15 – December 5 without gaps |
Scallions Planting Windows in California
- Indoor start: For many areas in California, the best indoor start window for scallions is from January 11 through March 12, depending on your zone.
- Transplant outdoors: Scallions can typically be transplanted outdoors anywhere from March 1 to April 15, with the exact timing based on local frost dates.
- Harvest: The harvest window for scallions in California generally runs from June 1 to December 5, giving ample time for multiple cuttings throughout the season.
Common Mistakes Growing Scallions in California
- Failing to account for California's microclimates can lead to poor scallion growth. Some areas may experience unexpected chill or heat, affecting your planting schedule.
- Many gardeners assume scallions can only be planted in cool weather. However, they can be sown throughout much of California's growing season, particularly in warmer zones, for a typical staggered harvest.
- Overcrowding scallions can lead to stunted growth. Scallions thrive in dense clusters, but it’s essential to give them enough space to grow. Set seedlings or sow seeds in rows to allow for healthy development.
- In California, it's common to overlook local soil conditions. Many areas might have clay-heavy soil, which hampers drainage. Always amend your soil for better consistency when growing scallions.
- Ignoring the signs of early frost can damage young scallion plants. Pay attention to the weather reports, especially during late spring, as late snows can occur in higher elevation areas in California.
Frequently Asked Questions
What if I'm in a cold pocket of California?
If you're in a colder microclimate, adjust your planting dates to reflect your area's last frost date. Use protective covers if temperatures threaten young plants, especially during unexpected cold snaps.
Can I still plant scallions in May?
Yes, you can plant scallions in May, especially in warmer zones. They typically thrive until summer heat sets in. Just be cautious about watering and heat exposure.
How can I tell when scallions are ready to be harvested?
Scallions are usually ready for harvest about 60 to 70 days after planting. Look for tall green tops and a healthy base. Harvest when tops are vibrant and firm for the best flavor.
Do scallions need a lot of sunlight?
Scallions prefer full sun but can tolerate partial shade, especially in California’s warmer zones. Aim for at least 4–6 hours of sunlight daily for optimal growth and flavor development.
Are scallions frost-tolerant?
Scallions can tolerate light frosts and can survive temperatures as low as 28°F. When growing in California, be prepared to cover them during extreme weather events to prolong the harvest season.
Keep Learning
City guides in California
Other crops in California
Typical fall sowing window for Scallions in California: September 17 – October 8.