One of the first steps you take when you are figuring out your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to estimate when it's a good idea to plant mustard by looking at the USDA zone info for Winthrop Harbor.

Planting Calendar for Mustard

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

Since mustard require warm weather you need to wait until after the last frost when the weather gets warmer before you can plant them.

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Winthrop Harbor. It might get as low as -15°F during the coldest months of winter.

Since the USDA zone info for Winthrop Harbor is an average the actual date of last frost will vary from year to year. Half of the time in Winthrop Harbor last frost occurs after April 15 so be sure to be ready to cover your mustard in the event of one of those late frosts.

USDA Zone Info for Winthrop Harbor

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 Winthrop Harbor

You may be interested in your other planting guides for Winthrop Harbor.