Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Princeton you can estimate when to plant black eyed susans by referring to the USDA zone info.

Planting Calendar for Black Eyed Susans

Frost tolerance for black eyed susans:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

It's probably a bad idea to plant black eyed susans until after the last frost because they are not cold tolerant.

The earliest that you can plant black eyed susans in Princeton 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 black eyed susans and expect a good harvest is probably August. You probably don't want to wait any later than that or else your black eyed susans may not have a chance to grow to maturity. Starting your black eyed susans indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on March 15 in Princeton. It might get as low as 10°F during the coldest months of winter.

Since the USDA zone info for Princeton is an average the actual date of last frost is different every year. Half of the time in Princeton last frost occurs after March 15 so make sure that you are prepared to cover your black eyed susans if you have a surprise late frost.

USDA Zone Info for Princeton

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°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 15°F.

Plants to Grow in Princeton

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