The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of determining when it's possible to plant zucchini is to look at the USDA zone info for Corona.

Planting Calendar for Zucchini

Frost tolerance for zucchini:	Not tolerant of frost.
When to plant:	After the last frost.

Since zucchini are not cold tolerant you must wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant zucchini in Corona is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant zucchini and expect a good harvest is probably September. If you wait any later than that and your zucchini may not have a chance to really do well. Starting your zucchini indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Corona. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for Corona is just an average the actual date of last frost changes from year to year. Half of the time in Corona you get a frost after February 15 so just be sure to be ready to protect your zucchini 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.