The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of determining when it's possible to plant perilla is to refer to the USDA zone info for Haverhill.

Planting Calendar for Perilla

Frost tolerance for perilla:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Perilla require warm weather which means that you need to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant perilla in Haverhill 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 perilla and expect a good harvest is probably August. Any later than that and your perilla may not have a chance to grow to maturity. Starting your perilla indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Haverhill the average date of last frost happens on April 15. You can expect an average low temperature of -10°F in the coldest months of winter.

Since the USDA zone info for Haverhill may not be accurate from year to year the actual date of last frost changes from year to year. Half of the time in Haverhill it frosts late in the year after April 15 so be sure to be ready to cover your perilla if you have a late frost.

USDA Zone Info for Haverhill

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 Haverhill

You may be interested in your other planting guides for Haverhill.