The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Decorah you can figure out when to plant mustard greens by reviewing 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 other plants that might not handle the cold.

The earliest that you can plant mustard greens in Decorah is March. However, you really should wait until April 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 August. Any later than that and your mustard greens may not have a chance to really do well. Starting your mustard greens indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on May 15 in Decorah. It might get as low as -25°F during the coldest months of winter.

Always keep in mind that USDA zone info for Decorah is an average and the actual date of last frost will vary from year to year. Half of the time in Decorah it frosts late in the year after May 15 so make sure that you are ready to cover your mustard greens if you have a surprise late frost.

USDA Zone Info for Decorah

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Decorah

You may be interested in your other planting guides for Decorah.