Before planting it is a good idea to find your USDA Zone info to determine 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.

The first chance to plant black radish in Gypsum should be estimated by using the USDA zone info.

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 do well in mild cold which means that you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant black radish in Gypsum 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. You probably don't want to wait any later than that or else 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

The average date of last frost is April 15 in Gypsum. You should expect an average low temperature of -20°F in the coldest months of winter.

Since the USDA zone info for Gypsum may not be accurate from year to year the actual date of last frost will vary from year to year. Half of the time in Gypsum you get a frost after April 15 so make sure that you are ready to protect your black radish in the event of one of those late frosts.

USDA Zone Info for Gypsum

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 Gypsum

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