The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Zone 1b you can determine when you can plant mustard greens by looking at 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.

Since mustard greens are moderately cold tolerant you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant mustard greens in Zone 1b is May. However, you really should wait until June 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 July. If you wait any later than that and your mustard greens may not have a chance to really do well. If you are starting your mustard greens indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost is on June 15 in Zone 1b. It might get as low as -55°F during the coldest months of winter.

Always keep in mind that USDA zone info for Zone 1b is just an average and the actual date of last frost is different every year. Since half of the time in Zone 1b there is a last frost after June 15 be ready to protect your mustard greens in the event of a late frost.

USDA Zone Info for Zone 1b

Here is the info for USDA Zone 1b.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-55°F
Highest Expected Low	-50°F

This means that on a really cold year, the coldest it will get is -55°F. On most years you should be prepared to experience lows near -50°F.

Plants to Grow in Zone 1b

You may be interested in your other planting guides for Zone 1b.