One of the best tools that you have as gardeners to help us estimate 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.

You should be able to estimate when it's possible to plant nierembergia by checking out the USDA zone info for Rainbow City.

Planting Calendar for Nierembergia

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

It's probably not a good idea to plant nierembergia until after the last frost because they require warm weather.

The earliest that you can plant nierembergia in Rainbow City is April. However, you really should wait until May if you don't want to take any chances.

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

Last Frost Date

On average the last frost has passed is on April 15 in Rainbow City. You can expect an average low temperature of 5°F in the coldest months of winter.

Since the USDA zone info for Rainbow City is not always accurate the actual date of last frost changes from year to year. Half of the time in Rainbow City last frost occurs after April 15 so make sure that you are prepared to cover your nierembergia if you have a late frost.

USDA Zone Info for Rainbow City

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 Rainbow City

You may be interested in your other planting guides for Rainbow City.