One of the best tools that you have as gardeners to help us figure out 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.

A way of getting a good idea when to plant snap beans is to refer to the USDA zone info for South San Francisco.

Planting Calendar for Snap beans

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

Snap beans are not cold tolerant which tells us that it's necessary to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant snap beans 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 snap beans and expect a good harvest is probably September. You probably don't want to wait any later than that or else your snap beans may not have a chance to fully mature. If you are starting your snap beans indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

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

Since the USDA zone info for South San Francisco may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in South San Francisco you get surprised by a frost after January 31 so make sure that you are prepared to cover your snap beans in the event of a 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.