One of the first steps you take when you are getting a good idea 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 will be able to estimate when it's possible to plant mustard by referring to the USDA zone info for Granite City.

Planting Calendar for Mustard

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

It's probably a bad idea to plant mustard until after the last frost has passed because they are not cold tolerant.

The earliest that you can plant mustard in Granite City 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. If you wait any later than that and your mustard may not have a chance to really do well. You can get started a couple of weeks earlier by starting your mustard indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Granite City. You can expect an average low temperature of -5°F in the coldest months of winter.

Since the USDA zone info for Granite City is an average the actual date of last frost will vary from year to year. Half of the time in Granite City it frosts late in the year after April 15 so just be sure to be ready to protect your mustard if you have one of those late frosts.

USDA Zone Info for Granite City

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Granite City

You may be interested in your other planting guides for Granite City.