Before planting it is a good idea to find your USDA Zone info to estimate 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.

By referring to the USDA zone info for South San Francisco you should be able to determine when it's a good idea to plant chervil.

Planting Calendar for Chervil

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

Since chervil do ok in moderate cold you can plant them a bit earlier in the year than plants that are more sensitive to the cold.

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

Last Frost Date

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

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 cover your chervil if you have a surprise late frost.

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.