When to Plant Arugula in Missouri (2026 Guide)
Arugula is one of the fastest-growing greens you can plant in your Missouri garden. This peppery salad green is not only high in nutrients but also easy to grow, making it a favorite among home gardeners. Rich in flavor, arugula typically matures in just 40 days, making it perfect for a quick harvest in both spring and fall. With the right timing and care, you can enjoy fresh arugula from your garden throughout the growing season.
In Missouri, the timing of planting arugula is crucial due to the distinct frost dates. For gardeners in Zone 6b, the median last frost date is April 10, while those in Zone 6a can expect their last frost around April 19. This means you should plan to start your seeds indoors or outdoors about 4–6 weeks prior to these dates, ensuring you can enjoy a bountiful crop before the onset of the summer heat.
To effectively extend your harvest, consider planting arugula again in late summer for a fall crop. Missouri's growing season provides ample opportunity for this delicious green, especially if you take advantage of the frost-free days between the last spring frost and the first fall frost in October. Understanding the best planting windows will help you enjoy arugula well into the season.
Planting Schedule by USDA Zone in Missouri
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start March 1 – March 15, ~6–8 weeks before April 10 | Transplant outdoors April 20 – April 30 | Direct sow April 20 – May 15 | Harvest May 30 – June 15 |
| Zone 6a | Start March 10 – March 24, ~6–8 weeks before April 19 | Transplant outdoors May 1 – May 10 | Direct sow May 1 – May 20 | Harvest June 10 – June 25 |
Arugula Planting Windows in Missouri
- Indoor start: For Missouri gardeners, the best time to start arugula indoors is from March 1 to March 24, depending on your USDA hardiness zone.
- Transplant outdoors: Transplant arugula outdoors between April 20 and May 10, ensuring the threat of frost has passed.
- Harvest: Harvest your arugula from May 30 through June 25 for the best flavors and textures.
Common Mistakes Growing Arugula in Missouri
- One common error is planting arugula too late in Missouri's spring. The best time to sow is before the last frost, so waiting too long will lead to bolting and a poor harvest.
- Overwatering is another mistake, especially in Missouri's humid climate. Arugula doesn't require constant moisture; instead, water deeply only when necessary to avoid root rot.
- Many gardeners ignore the potential of late frost in Missouri. Always check the forecast for unseasonably cold late spring nights before planting your arugula outdoors.
- Failing to consider Missouri's hot summer months can lead to disappointing results. Arugula thrives in cool weather, so plan for a fall planting or earlier spring harvest to avoid harsh conditions.
- Another mistake is neglecting pest control. In Missouri, flea beetles can destroy young arugula plants, so consider using row covers to keep these pests at bay.
Frequently Asked Questions
What if I’m in a colder pocket of Missouri?
If you're in a colder area, such as near the Ozarks, consider starting your arugula indoors earlier and shielding transplants from unexpected frosts with fabric or plastic cloches.
Can I still plant arugula in May?
While you can still plant arugula in May, be cautious as it may bolt quickly due to rising temperatures. Consider a variety that is heat-resistant and plant in partial shade if possible.
How can I extend my arugula harvest?
To extend your arugula harvest, practice successive sowing every 2–3 weeks starting in early spring. This ensures you can enjoy fresh greens well into summer and fall while managing heat sensitivity.
What are the signs that my arugula is ready to harvest?
Your arugula is ready to harvest when leaves reach 3-4 inches tall. For the best flavor, pick outer leaves regularly to encourage more growth and avoid bitterness as the plant matures.
How do I prevent flea beetles on my arugula?
To prevent flea beetles from damaging your arugula, use floating row covers during early growth stages. They effectively deter pests while allowing sunlight and moisture to reach the plants.
Keep Learning
City guides in Missouri
Other crops in Missouri
Typical fall sowing window for Arugula in Missouri: August 26 – September 16.