When can I plant Cuphea in Zone 1b

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

It's possible to estimate when it's a good idea to plant cuphea by reviewing the USDA zone info for Zone 1b.


Planting Calendar for Cuphea

Frost tolerance for cuphea: Not tolerant of frost.
When you should plant them: After all chance of frost has passed.

Cuphea are not cold tolerant which means that you really should wait until it warms up after the last frost before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant cuphea
Possibly ok, but a risky time to plant cuphea
Probably not a good time to plant cuphea

The earliest that you can plant cuphea 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 cuphea and expect a good harvest is probably July. Any later than that and your cuphea may not have a chance to really do well. If you are starting your cuphea indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Zone 1b the average date of last frost happens on June 15. In the coldest months of winter we should expect an average low temperature of -55°F.

It's important to remember that USDA zone info for Zone 1b is an average and our actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 1b we get a frost after June 15 be ready to cover your cuphea 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 our other planting guides for Zone 1b.