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

The USDA zone info for Romeoville should be reffered to in order to estimate when you can plant copperleaf.

Planting Calendar for Copperleaf

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

It's not a good idea to plant copperleaf until after the last frost has passed because they require warm weather.

The earliest that you can plant copperleaf in Romeoville 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 copperleaf and expect a good harvest is probably August. You probably don't want to wait any later than that or else your copperleaf may not have a chance to fully mature. If you are starting your copperleaf indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

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

Keep in mind that USDA zone info for Romeoville is an average and the actual date of last frost will vary from year to year. Half of the time in Romeoville last frost occurs after April 15 so always be ready to protect your copperleaf in the event of a late frost.

USDA Zone Info for Romeoville

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 Romeoville

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