One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By checking out the USDA zone info for Portola Valley it's a good idea to figure out when to plant sweet potato vine.

Planting Calendar for Sweet Potato Vine

Frost tolerance for sweet potato vine:	Not tolerant of frost.
When to plant:	After the last frost.

It's probably not a good idea to plant sweet potato vine until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant sweet potato vine in Portola Valley 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 sweet potato vine and expect a good harvest is probably September. You probably don't want to wait any later than that or else your sweet potato vine may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your sweet potato vine indoors.

Last Frost Date

The average date of last frost is January 31 in Portola Valley. You should expect an average low temperature of 30°F in the coldest months of winter.

Always keep in mind that USDA zone info for Portola Valley 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 Portola Valley there is a last frost after January 31 be ready to cover your sweet potato vine in the event of a surprise late frost.

USDA Zone Info for Portola Valley

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 Portola Valley

You may be interested in your other planting guides for Portola Valley.