One of the best tools that you have as gardeners to help us determine your gardening schedule is the 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.

The USDA zone info for Harlingen can be used to figure out when it's possible to plant flowering kale.

Planting Calendar for Flowering Kale

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

Flowering Kale do well in moderate cold which tells us that you can plant them a little bit earlier than plants that are more sensitive to the cold.

The earliest that you can plant flowering kale in Harlingen 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 flowering kale and expect a good harvest is probably October. You probably don't want to wait any later than that or else your flowering kale may not have a chance to really do well. You can get started a little bit earlier by starting your flowering kale indoors.

Last Frost Date

The average date of last frost is February 15 in Harlingen. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Harlingen is just an average the actual date of last frost will vary from year to year. Half of the time in Harlingen there is a last frost after February 15 so make sure that you are prepared to cover your flowering kale if you have a surprise late frost.

USDA Zone Info for Harlingen

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Harlingen

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