One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By reviewing the USDA zone info for Hays you will be able to determine when you can plant thunbergia.

Planting Calendar for Thunbergia

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

You can not plant thunbergia until after the last frost because they are not cold tolerant.

The earliest that you can plant thunbergia in Hays 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. Starting your thunbergia indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Since the USDA zone info for Hays is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Hays last frost occurs after April 15 so be sure to be ready to protect your thunbergia if you have one of those late frosts.

USDA Zone Info for Hays

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 Hays

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