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.

A common way of estimating when it's a good idea to plant spearmint is to examine the USDA zone info for San Jacinto.

Planting Calendar for Spearmint

Frost tolerance for spearmint:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since spearmint are very cold tolerant you can plant them quite a bit earlier in the year than other frost tender plants.

The earliest that you can plant spearmint in San Jacinto is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant spearmint and expect a good harvest is probably October. You probably don't want to wait any later than that or else your spearmint may not have a chance to grow to maturity. Starting your spearmint indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in San Jacinto. It might get as low as 25°F during the coldest months of winter.

Always keep in mind that USDA zone info for San Jacinto is an average and the actual date of last frost will vary from year to year. Half of the time in San Jacinto it frosts late in the year after February 15 so make sure that you are prepared to cover your spearmint in the event of a surprise late frost.

USDA Zone Info for San Jacinto

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in San Jacinto

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