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

The USDA zone info for Zone 1b can be looked at to figure out when to plant pentas.

Planting Calendar for Pentas

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

It's not a good idea to plant pentas until after the last frost has passed because they require warm weather.

The earliest that you can plant pentas 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 pentas and expect a good harvest is probably July. Any later than that and your pentas may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your pentas indoors.

Last Frost Date

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

Keep in mind that USDA zone info for Zone 1b may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Zone 1b last frost occurs after June 15 so always be ready to protect your pentas 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.