The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for River Grove can be reffered to in order to estimate when to plant cuphea.

Planting Calendar for Cuphea

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

You can not plant cuphea until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant cuphea in River Grove 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 grow to maturity. Starting your cuphea indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost has passed is on April 15 in River Grove. You should expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for River Grove may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in River Grove it frosts late in the year after April 15 be ready to protect your cuphea if you have a surprise late frost.

USDA Zone Info for River Grove

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 River Grove

You may be interested in your other planting guides for River Grove.