One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By checking out the USDA zone info for Coraopolis it's a good idea to figure out when to plant cardinal flower.

Planting Calendar for Cardinal Flower

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

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

The earliest that you can plant cardinal flower in Coraopolis 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 cardinal flower and expect a good harvest is probably August. You probably don't want to wait any later than that or else your cardinal flower may not have a chance to grow to maturity. Starting your cardinal flower indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Coraopolis. In the coldest months of winter you should expect an average low temperature of -5°F.

Since the USDA zone info for Coraopolis is just an average the actual date of last frost will vary from year to year. Half of the time in Coraopolis it frosts late in the year after April 15 so be sure to be ready to cover your cardinal flower in the event of a late frost.

USDA Zone Info for Coraopolis

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°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 0°F.

Plants to Grow in Coraopolis

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