When to Plant Scallions in North Dakota (2026 Guide)

Growing scallions in North Dakota is an excellent way to enjoy fresh, flavorful greens throughout the growing season. With hearty crop varieties that do well in slightly cooler temperatures, scallions thrive in the state's temperate climate. With a median last spring frost date of May 12 in Zone 5b cities like Fargo, it's crucial to understand the right times for planting and harvesting to maximize your yield.

Scallions can be direct-sown in the garden or started indoors to get a jump on the season. The tremendous adaptability of scallions allows for their planting from late March through early May, just before the last frost. In Zone 5a areas such as Dickinson, the median last frost is May 16, necessitating careful timing to avoid frost damage during the early stages of growth.

To ensure a continuous harvest, it's recommended to sow scallions in successive batches every 3–4 weeks. This method ensures a steady supply of fresh scallions from June through September, well within the frost-free growing period of approximately 134 days in Zone 5b. Understanding when to plant your crops and how to care for them will lead to a thriving garden filled with these versatile onions.

Planting Schedule by USDA Zone in North Dakota

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5b	Start March 15 – March 31, ~6–8 weeks before April 10	Transplant outdoors May 1 – May 12, after last frost	Direct sow May 12 – July 1, after last frost	Harvest from June 15 – September 23, before first frost
Zone 5a	Start March 15 – March 31, ~6–8 weeks before April 10	Transplant outdoors May 1 – May 16, after last frost	Direct sow May 16 – July 1, after last frost	Harvest from June 15 – September 19, before first frost

Scallions Planting Windows in North Dakota

Indoor start: Start sowing scallions indoors from March 15 to March 31 for optimal growth.
Transplant outdoors: Transplant scallions outdoors in North Dakota from May 1 to May 16 after the last spring frost.
Harvest: You can expect to start harvesting scallions from June 15 until September 19 before the first fall frost.

Common Mistakes Growing Scallions in North Dakota

One common error among gardeners in North Dakota is planting scallions too close together. This can lead to overcrowding, stunted growth, and poorer flavor. It's essential to give each plant enough space for maximum productivity and air circulation.
North Dakota's late spring snowfalls can catch new gardeners off guard. If you’ve started scallions too early, make sure to protect them from any surprise cold snaps or snow, which can damage young plants significantly.
Many new gardeners believe they can start scallions anytime during the season, but this is misleading. Planting in early spring before the last frost date risks killing your seedlings, especially in northern cities like Fargo, where frost vigilance is key.
Another common mistake is watering improperly after planting. North Dakota's winds can dry out the soil quickly, so consistent watering practices are crucial to keep scallions happy. Check soil moisture regularly to avoid drying out.
Overlooking the specific growing conditions of North Dakota can impact your yield. Understanding your local climate and adjusting planting and care routines will help cultivate the healthiest and most productive scallion plants.

Frequently Asked Questions

What if I'm in a cold pocket of North Dakota?

If you're in a particularly cold area, consider starting scallions indoors to give them a head start before transplanting them outside. This will help you avoid the risk of frost damage and allow for an earlier harvest.

Can I still plant scallions in May?

Yes, planting scallions in May is perfectly fine, especially after the last frost date. In fact, planting them by May 12 ensures that they can grow effectively through the growing season.

How do I store scallions once harvested?

To store harvested scallions, keep them in a cool, dark place or refrigerate them in a damp paper towel or a sealed plastic bag. This will extend their freshness and flavor for several days.

Can scallions survive a light frost?

Scallions can tolerate light frost and temperatures down to 28°F. If frost is expected, cover them with a row cover for protection, and consider cooking them after frost exposure for best flavor.

What's the best way to ensure continuous crops?

To achieve a continuous crop of scallions, practice succession planting. Sow seeds every 3-4 weeks throughout the growing season to ensure a steady supply from June until the first frost.