Before planting it is a good idea to find your USDA Zone info to estimate your garden 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 Glendale Heights should be read to determine when it's possible to plant lisianthus.

Planting Calendar for Lisianthus

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

Since lisianthus require warm weather it is necessary to wait until after the last frost before you can plant them.

The earliest that you can plant lisianthus in Glendale Heights 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 lisianthus and expect a good harvest is probably August. Any later than that and your lisianthus may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your lisianthus indoors.

Last Frost Date

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

Since the USDA zone info for Glendale Heights is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Glendale Heights you get surprised by a frost after April 15 be ready to protect your lisianthus if you have a late frost.

USDA Zone Info for Glendale Heights

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 Glendale Heights

You may be interested in your other planting guides for Glendale Heights.