The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to determine when you can plant thunbergia by reviewing the USDA zone info for Centralia.

Planting Calendar for Thunbergia

Frost tolerance for thunbergia:	Not tolerant of frost.
When to plant:	After the last frost.

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

The earliest that you can plant thunbergia in Centralia 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 thunbergia and expect a good harvest is probably August. Any later than that and your thunbergia may not have a chance to really do well. If you are starting your thunbergia indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Centralia. You can expect an average low temperature of -10°F in the coldest months of winter.

Since the USDA zone info for Centralia is an average the actual date of last frost changes from year to year. Since half of the time in Centralia you get surprised by a frost after April 15 be ready to protect your thunbergia if you have a surprise late frost.

USDA Zone Info for Centralia

Here is the info for USDA Zone 6a.

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

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

Plants to Grow in Centralia

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