The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Willowbrook you can figure out when it's the best time to plant mustard greens by referring to the USDA zone info.

Planting Calendar for Mustard greens

Frost tolerance for mustard greens:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Mustard greens are moderately cold tolerant which means that you can plant them earlier than more sensitive plants.

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

The last month that you can plant mustard greens and expect a good harvest is probably September. If you wait any later than that and your mustard greens may not have a chance to fully mature. You can get started a few weeks earlier by starting your mustard greens 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.

Since the USDA zone info for Willowbrook is an average the actual date of last frost will vary from year to year. Since half of the time in Willowbrook you get surprised by a frost after April 15 be ready to protect your mustard greens if you have a 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.