One of the first steps you take when you are getting a good idea your gardening schedule is find your 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 black eyed susans by looking at the USDA zone info for Zone 1a.

Planting Calendar for Black Eyed Susans

Frost tolerance for black eyed susans:	Not tolerant of frost.
When to plant:	After the last frost.

Black Eyed Susans require warm weather which tells us that it's necessary to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant black eyed susans in Zone 1a is June. However, you really should wait until July 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 July. You probably don't want to wait any later than that or else your black eyed susans may not have a chance to fully mature. You can get started a few weeks earlier by starting your black eyed susans indoors.

Last Frost Date

On average all chance of frost has passed is on June 15 in Zone 1a. You should expect an average low temperature of -60°F in the coldest months of winter.

Since the USDA zone info for Zone 1a may not be accurate from year to year the actual date of last frost changes from year to year. Half of the time in Zone 1a you get a frost after June 15 so make sure that you are prepared to cover your black eyed susans in the event of a late frost.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-60°F
Highest Expected Low	-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in your other planting guides for Zone 1a.