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

In Swarthmore you can determine when you can 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 the last frost.

Since black eyed susans require warm weather you have to wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant black eyed susans in Swarthmore 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. If you wait any later than that and your black eyed susans may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your black eyed susans indoors.

Last Frost Date

On average the last frost is on April 15 in Swarthmore. It might get as low as 0°F during the coldest months of winter.

Keep in mind that USDA zone info for Swarthmore may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in Swarthmore you get a frost after April 15 be ready to protect your black eyed susans in the event of one of those late frosts.

USDA Zone Info for Swarthmore

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 Swarthmore

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