Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for San Diego should be used to figure out when to plant runner beans.

Planting Calendar for Runner beans

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

Since runner beans require warm weather you have to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant runner beans in San Diego is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant runner beans and expect a good harvest is probably September. Any later than that and your runner beans may not have a chance to fully mature. You can get started a few weeks earlier by starting your runner beans indoors.

Last Frost Date

On average the last frost is on February 15 in San Diego. It might get as low as 20°F during the coldest months of winter.

Always keep in mind that the actual date of last frost is just an average because it is based on the USDA zone info for San Diego and it is different every year. Half of the time in San Diego there is a last frost after February 15 so always be ready to cover your runner beans in the event of a surprise late frost.

USDA Zone Info for San Diego

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in San Diego

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