One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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.

The best time to plant liatris in Zone 1b can be determined by checking out the USDA zone info.

Planting Calendar for Liatris

Frost tolerance for liatris:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since liatris do well in cold you can plant them much earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant liatris 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 liatris and expect a good harvest is probably July. Any later than that and your liatris may not have a chance to grow to maturity. If you are starting your liatris indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

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

Keep in mind that USDA zone info for Zone 1b is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 1b it frosts late in the year after June 15 be ready to protect your liatris in the event of one of those late frosts.

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.