When can I plant Coleus in Zone 1b

The USDA Zone info is a great tool for gardeners to help us determine our gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

It's possible to estimate when it's possible to plant coleus by referring to the USDA zone info for Zone 1b.


Planting Calendar for Coleus

Frost tolerance for coleus: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

You should not plant coleus until after the last frost when the weather gets warmer because they are not cold tolerant.

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

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

Last Frost Date

On average all chance of frost has passed is on June 15 in Zone 1b. 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 will vary from year to year. Since half of the time in Zone 1b we get surprised by a frost after June 15 be ready to cover your coleus 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.