When to Plant Arugula in New Hampshire (2026 Guide)

If you're contemplating growing arugula in New Hampshire, you're in for a treat. This fast-growing salad green thrives in the state's cool weather, allowing you to enjoy fresh greens from your own garden. With a median last spring frost date of May 11 in Zone 5b and April 28 in Zone 6a, planning your planting schedule is crucial for a successful harvest.

Arugula has a remarkable growth rate, taking as little as 40 days from seeding to maturity. Its bold flavor adds a delightful twist to many dishes, making it a popular choice for home gardeners. With a unique bite that becomes more intense as the weather warms up, savvy gardeners often opt to plant it in the cooler months to avoid bitterness.

To extend your harvest, consider planning successive sowings every 2–3 weeks. By doing so, you can fill your salad bowl with fresh arugula from April through June. This guide provides important tips on timing and caring for your plants, ensuring your arugula thrives in New Hampshire's unique climate.

Planting Schedule by USDA Zone in New Hampshire

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5b	Start March 15 – March 29, ~4–6 weeks before May 11	Transplant outdoors May 12 – May 26, after the last frost	Direct sow outdoors May 12 – June 10 for optimal growth	Harvest from June 15 – July 15, when leaves are 3–4 inches tall
Zone 6a	Start March 1 – March 15, ~4–6 weeks before April 28	Transplant outdoors April 29 – May 13, after the last frost	Direct sow outdoors April 29 – June 10 for a staggered harvest	Harvest from June 1 – July 1, catching the leaves at 3–4 inches tall

Arugula Planting Windows in New Hampshire

Indoor start: Start indoor seeding for arugula around March 1 to March 29, depending on your hardiness zone.
Transplant outdoors: You can transplant arugula outdoors in New Hampshire from April 29 to May 26, just after the last frost date.
Harvest: Expect to begin harvesting arugula approximately from June 1 through July 15, picking when leaves reach 3–4 inches in height.

Common Mistakes Growing Arugula in New Hampshire

One common mistake for New Hampshire gardeners is planting arugula too late into warmer weather. It bolts quickly in heat, so aiming for a planting date well before the last frost is crucial.
New Hampshire's spring can be unpredictable, leading to late snowfalls that can damage young arugula seedlings. Be prepared to cover your plants if late frosts threaten your early sown arugula.
Another mistake is ignoring soil conditions. New Hampshire has varying soil types, and arugula prefers well-draining, amended soil. Test your soil and amend with organic matter as needed to ensure optimal growth.
Overwatering is a frequent issue for new gardeners in New Hampshire, as spring rains can saturate the soil. Make sure to allow soil to dry slightly between waterings, promoting healthy root systems for your arugula.
Many gardeners underestimate the impact of pests like flea beetles in New Hampshire. These pests can quickly damage your arugula; using floating row covers can protect your crop effectively during early growth stages.

Frequently Asked Questions

What if I'm in a cold pocket of New Hampshire?

If you're in a colder microclimate, consider starting your arugula indoors a bit earlier and transplanting carefully after the last frost date. Use floating row covers to protect seedlings during unexpected cold spells.

Can I still plant arugula in May?

Absolutely! You can successfully direct sow arugula until June 10 in New Hampshire. Just ensure you monitor the weather to avoid heat that can cause the plants to bolt prematurely.

How do I keep pests off my arugula?

Preventing pests like flea beetles is vital. Use floating row covers during early growth stages, and remove them once plants are established to allow air circulation while keeping pests at bay.

When should I stop harvesting arugula?

Stop harvesting arugula once the leaves exceed 5 inches in height and the plant begins bolting, as this can lead to an undesirable bitterness in flavor. Opt instead for younger leaves which have a milder taste.

What other crops can I plant with arugula?

Great companions for arugula in New Hampshire include slower-growing crops such as carrots and beets. Planting these together allows for efficient use of space, as arugula is harvested well before the roots require room.

Keep Learning

Typical fall sowing window for Arugula in New Hampshire: August 3 – August 24.