The USDA Zone info is a great tool for gardeners to help us figure out 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 Grayslake can be looked at to figure out when it's possible to plant scarlet runner beans.

Planting Calendar for Scarlet Runner Beans

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

It's a bad idea to plant scarlet runner beans until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant scarlet runner beans in Grayslake 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 scarlet runner beans and expect a good harvest is probably August. You probably don't want to wait any later than that or else your scarlet runner beans may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your scarlet runner beans indoors.

Last Frost Date

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

Since the USDA zone info for Grayslake is an average the actual date of last frost will vary from year to year. Half of the time in Grayslake it frosts late in the year after April 15 so always be ready to protect your scarlet runner beans in the event of a late frost.

USDA Zone Info for Grayslake

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 Grayslake

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