One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Tomball you can figure out when it's a good idea to plant stevia by checking out the USDA zone info.

Planting Calendar for Stevia

Frost tolerance for stevia:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Stevia are not cold tolerant which means that it is necessary to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant stevia in Tomball 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 stevia and expect a good harvest is probably September. You probably don't want to wait any later than that or else your stevia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your stevia indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Tomball. In the coldest months of winter you should expect an average low temperature of 20°F.

It's important to remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Tomball and it will vary from year to year. Since half of the time in Tomball it frosts late in the year after February 15 be ready to protect your stevia if you have a late frost.

USDA Zone Info for Tomball

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 Tomball

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