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

A way of estimating when you can plant alternaria is to check out the USDA zone info for Twentynine Palms.

Planting Calendar for Alternaria

Frost tolerance for alternaria:	Not tolerant of frost.
When to plant:	After the last frost has passed.

You should not plant alternaria until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant alternaria in Twentynine Palms 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. Starting your alternaria indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Twentynine Palms. It might get as low as 20°F during the coldest months of winter.

Since the USDA zone info for Twentynine Palms is not always accurate the actual date of last frost is different every year. Half of the time in Twentynine Palms you get surprised by a frost after February 15 so always be ready to cover your alternaria if you have a late frost.

USDA Zone Info for Twentynine Palms

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 Twentynine Palms

You may be interested in your other planting guides for Twentynine Palms.