Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In South San Francisco you can estimate when you can plant creeping zinnia by using the USDA zone info.

Planting Calendar for Creeping Zinnia

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

Creeping Zinnia tend to make it in very little cold which tells us that you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant creeping zinnia in South San Francisco 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 creeping zinnia and expect a good harvest is probably September. If you wait any later than that and your creeping zinnia may not have a chance to grow to maturity. Starting your creeping zinnia indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In South San Francisco the average date of last frost happens on January 31. It might get as low as 30°F during the coldest months of winter.

Keep in mind that USDA zone info for South San Francisco may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Since half of the time in South San Francisco you get surprised by a frost after January 31 be ready to protect your creeping zinnia if you have one of those late frosts.

USDA Zone Info for South San Francisco

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 South San Francisco

You may be interested in your other planting guides for South San Francisco.