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.

You should be able to figure out when it's possible to plant diascia by reviewing the USDA zone info for Chattanooga.

Planting Calendar for Diascia

Frost tolerance for diascia:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant diascia a little bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

The earliest that you can plant diascia in Chattanooga 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 diascia and expect a good harvest is probably September. Any later than that and your diascia may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your diascia indoors.

Last Frost Date

The average date of last frost is April 15 in Chattanooga. In the coldest months of winter you can expect an average low temperature of 5°F.

Since the USDA zone info for Chattanooga is not always accurate the actual date of last frost is different every year. Half of the time in Chattanooga you get surprised by a frost after April 15 so just be sure to be ready to protect your diascia in the event of one of those late frosts.

USDA Zone Info for Chattanooga

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°F

This means that on a really cold year, the coldest it will get is 5°F. On most years you should be prepared to experience lows near 10°F.

Plants to Grow in Chattanooga

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