When to Plant Scallions in Utah (2026 Guide)
Growing scallions is a rewarding endeavor for Utah gardeners, as this versatile crop can thrive in various conditions found across the state. As the frost dates vary by zone, understanding when to plant can significantly impact your yield. For instance, in Zone 5b, the median last spring frost is May 11, while Zone 6a benefits from a much earlier date of April 27, allowing for an extended growing season.
Scallions are unique because they are harvested before any bulbs form, making them an ideal choice for a continuous supply throughout the growing season. With a relatively quick maturation period of about 60-70 days from seed, you can plant multiple batches for ongoing harvests. In Utah's climate, where temperature swings can occur, it's crucial to time your plantings correctly to avoid the damaging effects of late frosts.
Given Utah's roughly 135 to 174-day frost-free season depending on the zone, gardeners can maximize their harvests by following a succession planting schedule. This approach not only enhances productivity but also reduces waste. With a little care and attention to the unique climate of your area, you can enjoy fresh scallions from your home garden, whether you're located in American Fork or Bountiful.
Planting Schedule by USDA Zone in Utah
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Start March 27 – April 10, ~6–8 weeks before May 11 | Transplant outdoors after May 11, ~1 week after the last frost | Direct sow May 15 – July 1 for continued harvests | Harvest from June 15 – October 1 |
| Zone 6a | Start March 1 – March 20, ~6–8 weeks before April 27 | Transplant outdoors after April 27, ~1 week after the last frost | Direct sow May 1 – July 15 for continued harvests | Harvest from June 15 – October 18 |
| Zone 5a | Start March 27 – April 10, ~6–8 weeks before May 19 | Transplant outdoors after May 19, ~1 week after the last frost | Direct sow May 25 – July 1 for continued harvests | Harvest from June 25 – October 1 |
Scallions Planting Windows in Utah
- Indoor start: Start your scallion seeds indoors from March 1 to March 20 to get a jump on the growing season.
- Transplant outdoors: Transplant your scallions outdoors after the last frost, depending on your zone, with the earliest being April 27 in Zone 6a.
- Harvest: You can typically harvest scallions from mid-June through October, allowing for a prolonged period of fresh greens.
Common Mistakes Growing Scallions in Utah
- One common mistake in Utah is assuming scallions can only be planted in spring. Scallions tolerate cooler temperatures, so planting in early spring after the last frost can yield good results despite cooler nights.
- Many Utah gardeners do not stagger their plantings. Instead of sowing all seeds at once, a common error is to overlook the benefits of succession planting, potentially leading to over-saturation during peak harvest times.
- Watering too little or too much is frequent in Utah's varying climates. Ensure your soil is slightly moist but not saturated, which can lead to poor scallion growth. Overwatering can result in rot, especially if you have clay-heavy soil in your area.
- Ignoring the importance of soil quality is another frequent pitfall. Utah's alkaline soils often require amendments with organic matter to ensure proper drainage and nutrient retention to support healthy scallion growth.
- Some gardeners wait too long to harvest, thinking scallions need larger bulbs like traditional onions. In Utah, it’s essential to harvest scallions early to enjoy their best flavor and texture before they bolt.
Frequently Asked Questions
What if I'm in a cold pocket of Utah?
If you're in a colder area, consider starting your scallions indoors as recommended. By beginning your sowing process earlier in controlled conditions, you can ensure a successful transplant after the risk of frost has passed, even in chilly locations.
Can I still plant scallions in May?
Absolutely! While it's best to start earlier, you can directly sow scallions in May as the frost recedes. Just ensure to carry on with timely water and sun exposure for optimal growth, particularly during hot summer days.
What should I do if my scallions don't sprout?
If you're not seeing sprouts, check the soil moisture and temperature. Scallions prefer consistently moist soil and a cool environment to germinate. Too much heat or dryness can hinder sprouting. Adjust accordingly!
How do I know when my scallions are ready to harvest?
Harvest scallions when they're about 6-8 inches tall and the green tops are vibrant. If they start to flower or you notice bulging at the base, it's time to harvest. Regularly check as they grow to enjoy them fresh!
Are scallions frost-tolerant?
Yes, scallions are quite frost-tolerant and can survive light frosts. However, for the best texture and flavor, protect them with row covers when temperatures drop below 25°F, particularly late in the season.
Keep Learning
City guides in Utah
Other crops in Utah
Typical fall sowing window for Scallions in Utah: August 5 – August 26.