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.

In Phoenix you can estimate when it's a good idea to plant purple bell vines by looking at the USDA zone info.

Planting Calendar for Purple Bell Vines

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

Since purple bell vines are barely cold tolerant you can plant them just a tiny bit earlier in the year than other frost tender plants.

The earliest that you can plant purple bell vines in Phoenix 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 purple bell vines and expect a good harvest is probably September. Any later than that and your purple bell vines may not have a chance to really do well. You can get started a little bit earlier by starting your purple bell vines indoors.

Last Frost Date

On average the last frost has passed is on February 15 in Phoenix. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Phoenix is just an average the actual date of last frost changes from year to year. Since half of the time in Phoenix you get surprised by a frost after February 15 be ready to protect your purple bell vines if you have one of those late frosts.

USDA Zone Info for Phoenix

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 Phoenix

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