When to Plant Parsley in New Hampshire (2026 Guide)
If you're considering growing parsley in New Hampshire, understanding the state's frost dates is crucial for a successful harvest. For gardeners in the state, those dates vary significantly between zones, with Zone 5b experiencing a median last spring frost on May 11, and Zone 6a having an earlier date of April 28. By planning accordingly, you can maximize your growing season and enjoy fresh parsley all summer.
Parsley, a biennial herb usually grown as an annual, boasts two popular varieties: curly and flat-leaf Italian. Curly parsley is often used for garnishing, while the flat-leaf variety is favored by chefs for cooking due to its robust flavor. Understanding the right time to plant, care for, and harvest parsley can help cultivate a thriving crop in your New Hampshire garden.
With a growing season that ranges from approximately 142 days in Zone 5b to 164 days in Zone 6a, it's essential to adapt your gardening strategy based on your specific local climate. This guide will walk you through the best practices for planting and harvesting parsley based on New Hampshire's unique growing conditions, ensuring you make the most of your harvest.
Planting Schedule by USDA Zone in New Hampshire
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Start March 15 – March 31, ~6 weeks before May 11 | Transplant outdoors May 12 – May 31, after the last frost | Direct sow outdoors May 12 – June 1, after the last frost | Harvest from June 15 – October 1, before frost |
| Zone 6a | Start March 1 – March 15, ~6 weeks before April 28 | Transplant outdoors April 29 – May 15, after the last frost | Direct sow outdoors April 29 – May 15, after the last frost | Harvest from June 1 – October 9, before frost |
Parsley Planting Windows in New Hampshire
- Indoor start: For optimal growth, start parsley seeds indoors between March 1 and March 31 in Zone 6a, and March 15 to March 31 for Zone 5b.
- Transplant outdoors: Transplant parsley outdoors starting May 12 in Zone 5b and from April 29 in Zone 6a to avoid frost damage.
- Harvest: Harvest your parsley between June 1 and October 1 for Zone 6a, and June 15 to October 1 for Zone 5b, before the onset of frost.
Common Mistakes Growing Parsley in New Hampshire
- One common mistake in New Hampshire is planting parsley too late, especially in Zone 5b. The last frost date of May 11 means that seeds need to be started indoors in mid-March to ensure a robust crop. Overlooking this can lead to lower yields due to shorter growing periods.
- Many gardeners underestimate the impact of humidity on parsley growth in New Hampshire. High humidity can lead to fungal diseases, so ensuring proper air circulation and not overcrowding your plants is essential for healthy foliage.
- Gardeners in New Hampshire often forget to soak parsley seeds before planting. This step is crucial, as soaking seeds for 24 hours helps wash out germination inhibitors, transforming the germination time from 21 days to just 10–14 days.
- A serious mistake is over-harvesting parsley, especially during its active growing season. Remember to harvest no more than one-third of the plant, leaving enough stems to sustain continued growth. New Hampshire's shorter growing season can make this particularly important.
- Another often overlooked consideration is the frost risks in New Hampshire's coastal regions, which can be unpredictable. Understanding local microclimates and their corresponding frost dates can help mitigate the risk of a sulky summer harvest.
Frequently Asked Questions
Can I still plant parsley in May?
Yes, if you’re in Zone 5b, but keep an eye on the frost dates. It's best to transplant or direct sow parsley right after the last frost, which is May 11 in your area.
What if I’m in a cold pocket of New Hampshire?
If you find yourself in a colder region, adjust your planting dates. Consider starting parsley indoors earlier or using protective covers when transplanting outdoors.
How much sunlight does parsley need?
Parsley thrives in full sun to partial shade. Ideally, it should receive 6–8 hours of sunlight each day to produce healthy growth and yield.
How do I know when to harvest my parsley?
You can start harvesting parsley when the leaves reach about 6 inches tall. Remember to only harvest about one-third of the plant at a time to maintain overall health.
Is it too late to start parsley if I missed the spring window?
If you miss the early spring planting, you can still sow parsley in late summer or early fall, as it can survive light frost and even overwinter in some areas.
Keep Learning
City guides in New Hampshire
Other crops in New Hampshire
Typical fall sowing window for Parsley in New Hampshire: June 20 – July 11.