Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to determine when it's a good idea to plant cilantro by looking at the USDA zone info for Corona.

Planting Calendar for Cilantro

Frost tolerance for cilantro:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant cilantro just a tiny bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

The earliest that you can plant cilantro in Corona 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 cilantro and expect a good harvest is probably September. Any later than that and your cilantro may not have a chance to grow to maturity. You can get started a little bit earlier by starting your cilantro indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Corona. You should expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Corona is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Corona you get a frost after February 15 be ready to protect your cilantro in the event of a surprise late frost.

USDA Zone Info for Corona

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 Corona

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