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.

You should be able to figure out when it's a good idea to plant black radish by reviewing the USDA zone info for Charleston.

Planting Calendar for Black radish

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

You can plant black radish a little earlier in the year because they do well in moderate cold.

The earliest that you can plant black radish in Charleston is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant black radish and expect a good harvest is probably October. If you wait any later than that and your black radish may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your black radish indoors.

Last Frost Date

The average date of last frost is February 15 in Charleston. In the coldest months of winter you can expect an average low temperature of 20°F.

It's important to remember that USDA zone info for Charleston is not always accurate and the actual date of last frost will vary from year to year. Half of the time in Charleston there is a last frost after February 15 so be sure to be ready to protect your black radish if you have a late frost.

USDA Zone Info for Charleston

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Charleston

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