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.

In Zone 9b you can figure out when it's the best time to plant romanesco by reviewing the USDA zone info.

Planting Calendar for Romanesco

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

Since romanesco do well in moderate cold you can plant them just a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant romanesco in Zone 9b 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 romanesco and expect a good harvest is probably October. You probably don't want to wait any later than that or else your romanesco may not have a chance to fully mature. You can get started a few weeks earlier by starting your romanesco indoors.

Last Frost Date

On average the last frost is on February 15 in Zone 9b. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Zone 9b is not always accurate the actual date of last frost is different every year. Since half of the time in Zone 9b there is a last frost after February 15 be ready to cover your romanesco in the event of one of those late frosts.

USDA Zone Info for Zone 9b

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 Zone 9b

You may be interested in your other planting guides for Zone 9b.