Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant calliopsis in Zone 1b can be estimated by using the USDA zone info.

Planting Calendar for Calliopsis

Frost tolerance for calliopsis:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since calliopsis require warm weather it's necessary to wait until after the last frost before you can plant them.

The earliest that you can plant calliopsis in Zone 1b is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant calliopsis and expect a good harvest is probably July. If you wait any later than that and your calliopsis may not have a chance to fully mature. Starting your calliopsis indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on June 15 in Zone 1b. You should expect an average low temperature of -55°F in the coldest months of winter.

Remember that USDA zone info for Zone 1b may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Zone 1b last frost occurs after June 15 so always be ready to cover your calliopsis if you have a surprise 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.