When to Plant Arugula in Pennsylvania (2026 Guide)
Arugula is a fantastic choice for gardeners in Pennsylvania due to its fast growth and adaptability to cool weather. As a peppery salad green, it can be ready for harvest in just 40 days, making it ideal for those eager to start the gardening season. In Pennsylvania, timing your plantings is key, especially when considering the median last spring frost dates, such as April 23 in Zone 6a and May 4 in Zone 5b.
For optimal growth, gardeners should plant arugula 4-6 weeks before the last spring frost. This means starting your seeds indoors or direct sowing outdoors in late March or early April, depending on your specific USDA hardiness zone. Late summer plantings can be beneficial too, as arugula can be harvested well into the fall, with zone-specific first fall frost dates like October 9 in Zone 5b and October 17 in Zone 6a.
Arugula is not only versatile but also a delicious addition to any salad or dish. By staggering sowings every 2-3 weeks, Pennsylvania gardeners can enjoy a continuous harvest that lasts from spring through the fall. Just be mindful of local pests, such as flea beetles, and environmental conditions that may affect plant health.
Planting Schedule by USDA Zone in Pennsylvania
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start February 15 – March 1, ~6–8 weeks before April 23 | Transplant outdoors April 10 – April 20, after last frost | Direct sow outdoors April 10 – April 20, after last frost | Harvest from late April to early June, before bolting |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 4 | Transplant outdoors April 25 – May 1, after last frost | Direct sow outdoors April 25 – May 1, after last frost | Harvest from mid-May to early June, before bolting |
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 6 | Transplant outdoors March 25 – April 5, after last frost | Direct sow outdoors March 25 – April 5, after last frost | Harvest from late April to early June, before bolting |
Arugula Planting Windows in Pennsylvania
- Indoor start: For Pennsylvania, start arugula indoors from February 15 to March 15, depending on your zone.
- Transplant outdoors: Transplant outdoor seedlings from April 10 in Zone 6a to April 25 in Zone 5b, right after the last frost.
- Harvest: Harvest your arugula from late April through early June, ensuring you pick before bolting.
Common Mistakes Growing Arugula in Pennsylvania
- One common mistake Pennsylvania gardeners make is planting arugula too late in the season. This can lead to premature bolting as temperatures rise. Make sure to sow seeds in early spring and again in late summer for a successful harvest.
- Pennsylvania's climate can produce sudden late spring snows. Failing to protect your newly sown arugula can lead to loss. Consider using row covers to shield your plants during uncertain weather.
- Some gardeners don't take advantage of the peak growing season for arugula. They might skip the ideal sowing windows that lead to optimal yields. Always plan to sow at least 4 to 6 weeks prior to the last frost date for best results.
- Ignoring local pests is another common mistake in Pennsylvania. Flea beetles can quickly damage arugula. Use floating row covers early in the season to keep them at bay while allowing sunlight and moisture access.
- Overcrowding is a mistake frequently seen in Pennsylvania gardens. When sowing arugula, make sure to thin plants appropriately to ensure that each has enough space to grow without competition for resources.
Frequently Asked Questions
What if I'm in a cold pocket of Pennsylvania?
If you find yourself in a colder area, consider starting your arugula indoors to give it a head start. Once temperatures are consistently warm, you can transplant your seedlings outdoors for a more successful harvest. Always check local frost dates before planting.
Can I still plant arugula in May?
While the ideal last day for direct sowing in Zone 5b is May 1, you can still plant arugula in early May in cooler zones. Just remember that it may bolt sooner as the weather warms, so succession planting is key.
How can I keep pests away from my arugula?
Using floating row covers at the time of seeding is a reliable way to keep pests like flea beetles away. Additionally, regularly inspecting your plants and maintaining proper spacing will help ensure air circulation and plant health.
Can I grow arugula in containers?
Absolutely! Arugula grows well in containers, just ensure they have good drainage. Using high-quality potting soil and placing them in a cool, partially shaded area can also help prevent premature bolting.
What are the signs my arugula is ready to harvest?
Wait until the outer leaves of your arugula plant are 3-4 inches tall and have a healthy color. If the taste is still mild and not overly bitter, start harvesting. Remove the outer leaves and allow inner leaves to continue growing.
Keep Learning
City guides in Pennsylvania
Other crops in Pennsylvania
Typical fall sowing window for Arugula in Pennsylvania: August 22 – September 12.