One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The earliest that you can plant chrysocephalum in Bourbonnais should be estimated by reviewing the USDA zone info.

Planting Calendar for Chrysocephalum

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

You should not plant chrysocephalum until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant chrysocephalum in Bourbonnais 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 chrysocephalum and expect a good harvest is probably August. You probably don't want to wait any later than that or else your chrysocephalum may not have a chance to fully mature. You can get started a little bit earlier by starting your chrysocephalum indoors.

Last Frost Date

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

Keep in mind that USDA zone info for Bourbonnais may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Bourbonnais you get surprised by a frost after April 15 so be sure to be ready to cover your chrysocephalum in the event of one of those late frosts.

USDA Zone Info for Bourbonnais

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 Bourbonnais

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