One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A common way of getting a good idea when it's possible to plant tomatos is to refer to the USDA zone info for San Luis.

Planting Calendar for Tomatos

Frost tolerance for tomatos:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since tomatos require warm weather you need to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant tomatos in San Luis 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 tomatos and expect a good harvest is probably September. If you wait any later than that and your tomatos may not have a chance to grow to maturity. You can get started a little bit earlier by starting your tomatos indoors.

Last Frost Date

In San Luis the average date of last frost happens on January 31. In the coldest months of winter you should expect an average low temperature of 30°F.

Since the USDA zone info for San Luis is just an average the actual date of last frost will vary from year to year. Half of the time in San Luis there is a last frost after January 31 so make sure that you are ready to cover your tomatos in the event of a late frost.

USDA Zone Info for San Luis

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 Luis

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