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

One way of estimating when it's the best time to plant sweet potato vine is to examine the USDA zone info for San Marcos.

Planting Calendar for Sweet Potato Vine

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

Sweet Potato Vine are not cold tolerant which tells us that you need to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant sweet potato vine in San Marcos 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. If you wait any later than that and your sweet potato vine may not have a chance to fully mature. Starting your sweet potato vine indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on January 31 in San Marcos. In the coldest months of winter you can expect an average low temperature of 30°F.

Since the USDA zone info for San Marcos is just an average the actual date of last frost is different every year. Half of the time in San Marcos it frosts late in the year after January 31 so make sure that you are ready to cover your sweet potato vine in the event of a late frost.

USDA Zone Info for San Marcos

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 Marcos

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