When to Plant Scallions in New Hampshire (2026 Guide)
Scallions, also known as green onions, are a fantastic addition to any New Hampshire garden. With their fast growth and versatility, scallions can be harvested before they form bulbs, making them perfect for continuous crops throughout the growing season. In New Hampshire, with its varying frost dates, gardeners have unique opportunities for planting and harvesting scallions that can enhance their meals and garden productivity.
In areas like Concord and Derry, gardeners will experience a median last spring frost date of May 11, which allows for a strategic planting schedule to maximize yield. If you are located in Salem, with a median last frost of April 28, your planting season can begin a bit earlier, giving you a head start. Understanding these frost timings will significantly impact your success in growing scallions and ensure a plentiful harvest.
To grow scallions effectively in New Hampshire, it's essential to consider the entire frost-free season, which varies by zone. Zone 5b has about a 142-day growing season, whereas Zone 6a offers around 164 days. By understanding your specific zone and the impact of local climate factors, you can enjoy fresh scallions long into the fall harvesting them before first frost, which typically arrives by September 30 in Zone 5b.
Planting Schedule by USDA Zone in New Hampshire
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 11 | Transplant outdoors May 12 – June 10 | Direct sow April 15 – June 30 | Harvest June 15 – September 30 |
| Zone 6a | Start February 15 – March 1, ~6–8 weeks before April 28 | Transplant outdoors April 29 – June 10 | Direct sow March 15 – June 30 | Harvest May 30 – October 9 |
Scallions Planting Windows in New Hampshire
- Indoor start: For New Hampshire's Zone 5b, start scallions indoors between March 1 and March 15, while in Zone 6a, begin as early as February 15.
- Transplant outdoors: Transplant your scallions outdoors in Zone 5b from May 12 to June 10 and in Zone 6a from April 29 to June 10.
- Harvest: In New Hampshire, scallions are ready to harvest from June 15 to September 30 in Zone 5b and from May 30 to October 9 in Zone 6a.
Common Mistakes Growing Scallions in New Hampshire
- Many gardeners in New Hampshire underestimate the impact of late spring frosts. While the general last frost date may be May 11 in Zone 5b, unexpected cold snaps can occur, damaging young scallions. Always check local forecasts before planting and consider protective measures.
- Overwatering is a common issue among scallion growers in New Hampshire due to the region's sometimes unpredictable spring rainfall and humidity levels. Ensuring good drainage will promote healthy growth and prevent root rot, which can quickly ruin your crop.
- Planting too late is another frequent mistake. Scallions thrive in cooler temperatures but have a limited window before the first fall frost, which can be as early as September 30 in Zone 5b. It's crucial to plan your planting schedule to ensure a full harvest before cooler weather sets in.
- Ignoring space management can lead to poor yields. In New Hampshire's diverse climates, scallions benefit from planting densely, but failing to space them correctly can stunt their growth. Use succession planting techniques to optimize your space and maximize your harvest.
- Many believe scallions are entirely frost-tolerant due to their hardiness. Although they can withstand light frost, established plants may still suffer damage from temperatures below 28°F. In New Hampshire, be prepared to cover your scallions as fall approaches to protect against unexpected frosts.
Frequently Asked Questions
What if I'm in a cold pocket of New Hampshire?
If you're in a colder microclimate, consider starting your scallions indoors a bit earlier than recommended. Additionally, use row covers or cloches during unexpected cold events to protect young plants and ensure a successful growing season.
Can I still plant scallions in May?
Yes, it is still a suitable time to plant scallions in May, especially in Zone 6a, where the last frost is earlier. Just be aware that planting later means you have less time for successive sowing before the first fall frost in September.
Should I fertilize my scallions?
Absolutely! Scallions benefit from a balanced fertilizer applied as they start growing in the spring. This will boost their growth rates and the overall yield, especially if your soil is less nutrient-rich.
How can I extend the harvest of my scallions?
After harvesting scallions, leave 1-2 inches of the white base with the roots intact. Replant them in moist soil or place them in water on a windowsill, and new green growth will appear quickly, providing a supplementary crop with minimal effort.
What do I do if frost is expected?
If frost threatens your scallions, cover them with row covers or blankets overnight to protect them. It’s essential to keep an eye on the weather forecast and take preventive measures as temperatures drop, especially in late fall.
Keep Learning
City guides in New Hampshire
Other crops in New Hampshire
Typical fall sowing window for Scallions in New Hampshire: July 14 – August 4.