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

In Troy you can determine when it's possible to plant thunbergia by using the USDA zone info.

Planting Calendar for Thunbergia

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

It's probably a bad idea to plant thunbergia until after the last frost when the weather gets warmer because they require warm weather.

The earliest that you can plant thunbergia in Troy 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. If you wait any later than that and your thunbergia may not have a chance to really do well. You can get started a little bit earlier by starting your thunbergia indoors.

Last Frost Date

The average date of last frost is April 15 in Troy. It might get as low as -15°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Troy may not be accurate from year to year and the actual date of last frost will vary from year to year. Since half of the time in Troy last frost occurs after April 15 be ready to cover your thunbergia if you have a surprise late frost.

USDA Zone Info for Troy

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Troy

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