One of the first steps you take when you are estimating 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.

You should be able to figure out when it's possible to plant chrysanthemums by reviewing the USDA zone info for Willowbrook.

Planting Calendar for Chrysanthemums

Frost tolerance for chrysanthemums:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Chrysanthemums do ok in mild cold which means that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant chrysanthemums in Willowbrook is March. However, you really should wait until April if you don't want to take any chances.

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

Last Frost Date

The average date of last frost is April 15 in Willowbrook. You can expect an average low temperature of -15°F in the coldest months of winter.

Keep in mind that USDA zone info for Willowbrook is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Willowbrook last frost occurs after April 15 so make sure that you are ready to cover your chrysanthemums in the event of a surprise late frost.

USDA Zone Info for Willowbrook

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 Willowbrook

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