One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant oxalis in Oak Brook should be figured out by checking out the USDA zone info.

Planting Calendar for Oxalis

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

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

The earliest that you can plant oxalis 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 oxalis and expect a good harvest is probably August. Any later than that and your oxalis may not have a chance to really do well. Starting your oxalis indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

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 a frost after April 15 be ready to cover your oxalis 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.