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.

A common way of estimating when it's possible to plant trachelium is to refer to the USDA zone info for Diamond Bar.

Planting Calendar for Trachelium

Frost tolerance for trachelium:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since trachelium require warm weather you need to wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant trachelium in Diamond Bar 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 trachelium and expect a good harvest is probably September. Any later than that and your trachelium may not have a chance to really do well. You can get started a couple of weeks earlier by starting your trachelium indoors.

Last Frost Date

On average the last frost is on January 31 in Diamond Bar. In the coldest months of winter you should expect an average low temperature of 30°F.

Remember that USDA zone info for Diamond Bar may not be accurate from year to year and the actual date of last frost changes from year to year. Half of the time in Diamond Bar there is a last frost after January 31 so be sure to be ready to protect your trachelium if you have a late frost.

USDA Zone Info for Diamond Bar

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 Diamond Bar

You may be interested in your other planting guides for Diamond Bar.