Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Barstow can be read to determine when to plant pentas.

Planting Calendar for Pentas

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

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

The earliest that you can plant pentas in Barstow 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 pentas and expect a good harvest is probably September. Any later than that and your pentas may not have a chance to grow to maturity. Starting your pentas indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on February 15 in Barstow. You should expect an average low temperature of 20°F in the coldest months of winter.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Barstow and it can change quite a bit from year to year. Half of the time in Barstow it frosts late in the year after February 15 so make sure that you are ready to protect your pentas if you have one of those late frosts.

USDA Zone Info for Barstow

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 Barstow

You may be interested in your other planting guides for Barstow.