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

The earliest that you can plant browallia in Austin can be figured out by using the USDA zone info.

Planting Calendar for Browallia

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

Browallia require warm weather which means that you have to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant browallia in Austin is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant browallia and expect a good harvest is probably August. If you wait any later than that and your browallia may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your browallia indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Austin. You should expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Austin is just an average the actual date of last frost is different every year. Since half of the time in Austin you get a frost after May 15 be ready to protect your browallia if you have one of those late frosts.

USDA Zone Info for Austin

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°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 -20°F.

Plants to Grow in Austin

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