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.

The USDA zone info for Hackettstown can be reffered to in order to determine when it's the best time to plant erysimum.

Planting Calendar for Erysimum

Frost tolerance for erysimum:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant erysimum just a bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant erysimum in Hackettstown 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 erysimum and expect a good harvest is probably September. If you wait any later than that and your erysimum may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your erysimum indoors.

Last Frost Date

In Hackettstown 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 Hackettstown is an average the actual date of last frost is different every year. Since half of the time in Hackettstown there is a last frost after April 15 be ready to cover your erysimum if you have a late frost.

USDA Zone Info for Hackettstown

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 Hackettstown

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