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

It's possible to figure out when it's possible to plant black radish by using the USDA zone info for Sioux City.

Planting Calendar for Black radish

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

Black radish can survive in mild cold which tells us that you can plant them a little earlier in the year than more sensitive plants.

The earliest that you can plant black radish in Sioux City 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 black radish and expect a good harvest is probably September. Any later than that and your black radish may not have a chance to really do well. You can get started a few weeks earlier by starting your black radish indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Sioux City. You can expect an average low temperature of -20°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Sioux City may not be accurate from year to year and the actual date of last frost is different every year. Half of the time in Sioux City last frost occurs after April 15 so always be ready to protect your black radish if you have one of those late frosts.

USDA Zone Info for Sioux City

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°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 -15°F.

Plants to Grow in Sioux City

You may be interested in your other planting guides for Sioux City.