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.

By using the USDA zone info for San Marcos it's possible to estimate when it's possible to plant datura.

Planting Calendar for Datura

Frost tolerance for datura:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Datura do ok in some cold which means that you can plant them slightly earlier in the year than other frost tender plants.

The earliest that you can plant datura 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 datura and expect a good harvest is probably September. You probably don't want to wait any later than that or else your datura may not have a chance to fully mature. You can get started a little bit earlier by starting your datura indoors.

Last Frost Date

The average date of last frost is January 31 in San Marcos. It might get as low as 30°F during the coldest months of winter.

Since the USDA zone info for San Marcos may not be accurate from year to year the actual date of last frost will vary from year to year. Half of the time in San Marcos you get surprised by a frost after January 31 so make sure that you are ready to cover your datura if you have a surprise 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.