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.

You should be able to figure out when it's the best time to plant digitalis by looking at the USDA zone info for Cary.

Planting Calendar for Digitalis

Frost tolerance for digitalis:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Digitalis are one of those plants that can tolerate a little bit of cold weather which tells us that you can plant them earlier than other plants that might not handle the cold.

The earliest that you can plant digitalis in Cary is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant digitalis and expect a good harvest is probably September. You probably don't want to wait any later than that or else your digitalis may not have a chance to grow to maturity. Starting your digitalis indoors is a great way to get them started a little bit earlier.

Last Frost Date

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

Since the USDA zone info for Cary is an average the actual date of last frost changes from year to year. Half of the time in Cary last frost occurs after April 15 so make sure that you are prepared to protect your digitalis in the event of a late frost.

USDA Zone Info for Cary

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 Cary

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