The USDA Zone info is a great tool for gardeners to help us determine 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 a good idea to figure out when it's a good idea to plant runner beans by looking at the USDA zone info for Napa.

Planting Calendar for Runner beans

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

Runner beans require warm weather which tells us that you must wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant runner beans in Napa 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. If you wait any later than that and your runner beans may not have a chance to really do well. You can get started a little bit earlier by starting your runner beans indoors.

Last Frost Date

On average the last frost has passed is on February 15 in Napa. You should expect an average low temperature of 25°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Napa is just an average and the actual date of last frost is different every year. Half of the time in Napa it frosts late in the year after February 15 so make sure that you are ready to protect your runner beans in the event of a surprise late frost.

USDA Zone Info for Napa

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Napa

You may be interested in your other planting guides for Napa.