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 can determine when it's possible to plant cerastium in Zone 1b by checking out the USDA zone info.

Planting Calendar for Cerastium

Frost tolerance for cerastium:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since cerastium are moderately cold tolerant you can plant them a little earlier in the year than more sensitive plants.

The earliest that you can plant cerastium 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 cerastium and expect a good harvest is probably July. You probably don't want to wait any later than that or else your cerastium may not have a chance to fully mature. Starting your cerastium indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is June 15 in Zone 1b. In the coldest months of winter you can expect an average low temperature of -55°F.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 1b and it will vary from year to year. Since half of the time in Zone 1b you get a frost after June 15 be ready to cover your cerastium if you have 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.