One of the first steps you take when you are getting a good idea your gardening schedule is find your 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.

A way of estimating when it's the best time to plant tithonia is to use the USDA zone info for Chula Vista.

Planting Calendar for Tithonia

Frost tolerance for tithonia:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You can not plant tithonia until after the last frost because they are not cold tolerant.

The earliest that you can plant tithonia in Chula Vista 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 tithonia and expect a good harvest is probably September. Any later than that and your tithonia may not have a chance to really do well. Starting your tithonia indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Chula Vista the average date of last frost happens on January 31. It might get as low as 35°F during the coldest months of winter.

Remember that the actual date of last frost is just an average because it is based on the USDA zone info for Chula Vista and it changes from year to year. Since half of the time in Chula Vista it frosts late in the year after January 31 be ready to protect your tithonia in the event of a late frost.

USDA Zone Info for Chula Vista

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	35°F
Highest Expected Low	40°F

This means that on a really cold year, the coldest it will get is 35°F. On most years you should be prepared to experience lows near 40°F.

Plants to Grow in Chula Vista

You may be interested in your other planting guides for Chula Vista.