One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You will be able to determine when you can plant iresene by looking at the USDA zone info for New Haven.

Planting Calendar for Iresene

Frost tolerance for iresene:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Iresene are not cold tolerant which means that it's necessary to wait until it warms up after all chance of frost has passed before you can plant them.

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

The last month that you can plant iresene and expect a good harvest is probably August. Any later than that and your iresene may not have a chance to fully mature. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in New Haven. It might get as low as -10°F during the coldest months of winter.

It's important to remember that USDA zone info for New Haven may not be accurate from year to year and the actual date of last frost changes from year to year. Since half of the time in New Haven you get surprised by a frost after April 15 be ready to protect your iresene if you have a late frost.

USDA Zone Info for New Haven

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°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.