When can I plant Coleus in Zone 3a

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

The first chance to plant coleus in Zone 3a can be determined by looking at the USDA zone info.


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.

Since coleus require warm weather it's important to wait until after the last frost when the weather gets warmer before you can plant them.

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 3a 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 coleus and expect a good harvest is probably August. You probably don't want to wait any later than that or else your coleus may not have a chance to grow to maturity. Starting your coleus indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Zone 3a the average date of last frost happens on May 15. We can expect an average low temperature of -40°F in the coldest months of winter.

It's important to remember that USDA zone info for Zone 3a is not always accurate and our actual date of last frost is different every year. Since half of the time in Zone 3a we get a frost after May 15 be ready to protect your coleus if we have a surprise late frost.

USDA Zone Info for Zone 3a

Here is the info for USDA Zone 3a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-40°F
Highest Expected Low-35°F

This means that on a really cold year, the coldest it will get is -40°F. On most years you should be prepared to experience lows near -35°F.

Plants to Grow in Zone 3a

You may be interested in our other planting guides for Zone 3a.