The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of estimating when it's a good idea to plant alternaria is to refer to the USDA zone info for Santa Clara.

Planting Calendar for Alternaria

Frost tolerance for alternaria:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since alternaria require warm weather you must wait until after the last frost before you can plant them.

The earliest that you can plant alternaria in Santa Clara is March. However, you really should wait until April if you don't want to take any chances.

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

Last Frost Date

On average all chance of frost has passed is on February 15 in Santa Clara. In the coldest months of winter you should expect an average low temperature of 25°F.

Just be sure to remember that USDA zone info for Santa Clara may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Santa Clara last frost occurs after February 15 so be sure to be ready to cover your alternaria in the event of a surprise late frost.

USDA Zone Info for Santa Clara

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 Santa Clara

You may be interested in your other planting guides for Santa Clara.