One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Rialto you can determine when it's a good idea to plant crossandra by referring to the USDA zone info.

Planting Calendar for Crossandra

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

Since crossandra do not do well in cold weather you must wait until after the last frost when the weather gets warmer before you can plant them.

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

Last Frost Date

On average the last frost when the weather gets warmer is on January 31 in Rialto. In the coldest months of winter you should expect an average low temperature of 30°F.

Since the USDA zone info for Rialto is an average the actual date of last frost is different every year. Since half of the time in Rialto you get a frost after January 31 be ready to cover your crossandra in the event of one of those late frosts.

USDA Zone Info for Rialto

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in Rialto

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