One of the best tools that you have as gardeners to help us estimate your gardening schedule is the 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 first opportunity to plant browallia in Oak Brook should be determined by looking at the USDA zone info.

Planting Calendar for Browallia

Frost tolerance for browallia:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

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

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

Last Frost Date

The average date of last frost is April 15 in Oak Brook. In the coldest months of winter you should expect an average low temperature of -15°F.

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

USDA Zone Info for Oak Brook

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 Oak Brook

You may be interested in your other planting guides for Oak Brook.