The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Riverdale should be read to estimate when it's possible to plant cuphea.

Planting Calendar for Cuphea

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

Since cuphea do not do well in cold weather you need to wait until after the last frost has passed before you can plant them.

The earliest that you can plant cuphea in Riverdale 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 cuphea and expect a good harvest is probably August. If you wait any later than that and your cuphea may not have a chance to really do well. You can get started a little bit earlier by starting your cuphea indoors.

Last Frost Date

The average date of last frost is April 15 in Riverdale. It might get as low as -10°F during the coldest months of winter.

Since the USDA zone info for Riverdale is an average the actual date of last frost changes from year to year. Half of the time in Riverdale you get surprised by a frost after April 15 so make sure that you are prepared to protect your cuphea if you have a late frost.

USDA Zone Info for Riverdale

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 Riverdale

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