The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's possible to determine when you can plant scarlet runner beans by referring to the USDA zone info for San Rafael.

Planting Calendar for Scarlet Runner Beans

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

Since scarlet runner beans require warm weather it is important to wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant scarlet runner beans in San Rafael 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 scarlet runner beans and expect a good harvest is probably September. You probably don't want to wait any later than that or else your scarlet runner beans may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your scarlet runner beans indoors.

Last Frost Date

In San Rafael the average date of last frost happens on January 31. You can expect an average low temperature of 30°F in the coldest months of winter.

Since the USDA zone info for San Rafael is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in San Rafael you get a frost after January 31 so just be sure to be ready to cover your scarlet runner beans if you have a late frost.

USDA Zone Info for San Rafael

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 San Rafael

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