One of the best tools that you have as gardeners to help us figure out 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.

By referring to the USDA zone info for Sonora you should be able to figure out when it's a good idea to plant kohlrabi.

Planting Calendar for Kohlrabi

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

Kohlrabi can survive in some cold which means that 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 kohlrabi in Sonora 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 kohlrabi and expect a good harvest is probably October. You probably don't want to wait any later than that or else your kohlrabi may not have a chance to fully mature. Starting your kohlrabi indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

It's important to remember that USDA zone info for Sonora is an average and the actual date of last frost is different every year. Since half of the time in Sonora last frost occurs after February 15 be ready to protect your kohlrabi in the event of a late frost.

USDA Zone Info for Sonora

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 Sonora

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