When to Plant Cilantro in New Hampshire (2026 Guide)
Cilantro is a versatile herb that thrives in New Hampshire's cooler seasons, making it a staple for many home gardeners. In the state's varied climate, understanding when to plant cilantro is crucial to ensuring a successful harvest. For Zone 5b residents, the median last spring frost is typically around May 11, while those in Zone 6a can expect this date as early as April 28, allowing for different planting strategies.
Growing cilantro at home enhances any kitchen experience, delivering a fresher flavor than store-bought options. To achieve this, it's vital to know your gardening zone—most of New Hampshire falls under Zones 5b and 6a. Given that cilantro doesn't thrive in heat, understanding its frost-free growing plan can help maximize your yields while emphasizing optimal planting windows.
Whether you're in Manchester, Nashua, or the surrounding areas, planning your cilantro sowing dates will directly impact the quality and quantity of your harvest. With harvest windows extending from late spring to early fall depending on your zone, you can enjoy this flavorful herb throughout the growing season by practicing succession planting every few weeks.
Planting Schedule by USDA Zone in New Hampshire
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Not recommended — direct sow only | Not recommended — direct sow only | Sow seeds outdoors March 15 – April 1, ~6 weeks after the last frost | Harvest from May 11 – September 30, about 3–6 weeks after sowing |
| Zone 6a | Not recommended — direct sow only | Not recommended — direct sow only | Sow seeds outdoors April 1 – April 15, ~6 weeks after the last frost | Harvest from April 28 – October 9, about 3–6 weeks after sowing |
Cilantro Planting Windows in New Hampshire
- Indoor start: Do not attempt to start cilantro indoors in New Hampshire; direct sowing is essential due to its taproot.
- Transplant outdoors: Transplanting cilantro is not recommended; direct sowing is advised instead.
- Harvest: For cilantro harvested in New Hampshire, expect your best yields from May 11 until September 30, following your planting dates.
Common Mistakes Growing Cilantro in New Hampshire
- Many gardeners in New Hampshire underestimate the impact of late spring snows on their cilantro. These weather events can damage young seedlings, so make sure to delay sowing until after the expected frost dates.
- Overcrowding is a common error among cilantro growers. In New Hampshire's varying climate, especially in cooler areas, it's essential to allow space between plants to ensure proper air circulation and to avoid diseases in humid conditions.
- Failing to plan for the heat can lead to bolting in cilantro. New Hampshire can experience heat domes during summer months; therefore, succession planting helps keep plants producing flavorful leaves even as temperatures rise.
- Many New Hampshire gardeners assume they can grow cilantro all season long. This herb bolts quickly in prolonged warm weather, so understanding the short harvest window and planning for it is vital for a successful crop.
- Ignoring cilantro's tendency to cross-pollinate with dill is a mistake. This can lead to undesirable flavored seeds and affects future crops, so ensure proper spacing between these herbs to maintain flavor quality.
Frequently Asked Questions
What if I'm in a cold pocket of New Hampshire?
If you're in a cooler area, wait until the last frost date before planting cilantro outdoors. Consider using row covers to help warm the soil and promote germination, ensuring you take advantage of the short growing season.
Can I still plant cilantro in May?
Yes, you can plant cilantro in May, especially if you're in Zone 6a. Just be cautious of the rising temperatures to prevent bolting and consider sowing your seeds right after the last expected frost.
How often should I sow cilantro seeds?
For continuous harvest, sow cilantro seeds every 2-3 weeks during the growing season. This practice ensures a steady supply of cilantro, especially since individual plant cycles are short.
What happens if I plant cilantro too late?
Planting too late in the season can lead to reduced yields and bolting as temperatures rise. Be sure to check your frost dates to get your sowing schedule right for optimal growth.
How do I care for cilantro during hot spells?
Provide some shade during excessively hot spells to reduce stress on cilantro. Water regularly to maintain soil moisture and prevent early bolting. By providing care, you can keep plants producing leafy harvests longer.
Keep Learning
City guides in New Hampshire
Other crops in New Hampshire
Typical fall sowing window for Cilantro in New Hampshire: July 10 – July 31.