One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By reviewing the USDA zone info for San Marcos it's a good idea to determine when to plant mustard.

Planting Calendar for Mustard

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

Mustard do not do well in cold weather which tells us that it is important to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant mustard 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 mustard and expect a good harvest is probably September. If you wait any later than that and your mustard may not have a chance to fully mature. Starting your mustard indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last 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 may not be accurate from year to year the actual date of last frost is different every year. Half of the time in San Marcos last frost occurs after January 31 so always be ready to cover your mustard in the event of 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.