The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to figure out when it's a good idea to plant nigella by checking out the USDA zone info for New Haven.

Planting Calendar for Nigella

Frost tolerance for nigella:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Nigella do well in cold which tells us that you can get them planted much earlier than other frost tender plants.

The earliest that you can plant nigella in New Haven is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant nigella and expect a good harvest is probably September. You probably don't want to wait any later than that or else your nigella may not have a chance to fully mature. You can get started a few weeks earlier by starting your nigella indoors.

Last Frost Date

The average date of last frost is April 15 in New Haven. It might get as low as 0°F during the coldest months of winter.

Since the USDA zone info for New Haven may not be accurate from year to year the actual date of last frost is different every year. Half of the time in New Haven it frosts late in the year after April 15 so be sure to be ready to protect your nigella in the event of a surprise late frost.

USDA Zone Info for New Haven

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in New Haven

You may be interested in your other planting guides for New Haven.