The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant gladiolus in San Diego should be figured out by using the USDA zone info.

Planting Calendar for Gladiolus

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

Gladiolus tend to make it in very little cold which means that you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant gladiolus in San Diego 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 gladiolus and expect a good harvest is probably September. If you wait any later than that and your gladiolus may not have a chance to really do well. You can get started a few weeks earlier by starting your gladiolus indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in San Diego. You should expect an average low temperature of 20°F in the coldest months of winter.

Keep in mind that USDA zone info for San Diego is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in San Diego you get surprised by a frost after February 15 so be sure to be ready to cover your gladiolus if you have a late frost.

USDA Zone Info for San Diego

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in San Diego

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