When can I plant Dipladenia in Zone 4b

One of the first steps we take when we are getting a good idea our gardening schedule is find our USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

You can figure out when to plant dipladenia in Zone 4b by referring to the USDA zone info.


Planting Calendar for Dipladenia

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

Since dipladenia require warm weather you need to wait until after the last frost when the weather gets warmer before you can plant them.

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

The earliest that you can plant dipladenia in Zone 4b 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 dipladenia and expect a good harvest is probably August. Any later than that and your dipladenia may not have a chance to grow to maturity. If you are starting your dipladenia indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Zone 4b the average date of last frost happens on May 15. We should expect an average low temperature of -25°F in the coldest months of winter.

Remember that USDA zone info for Zone 4b is not always accurate and our actual date of last frost is different every year. Since half of the time in Zone 4b we get a frost after May 15 be ready to cover your dipladenia if we have one of those late frosts.

USDA Zone Info for Zone 4b

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-25°F
Highest Expected Low-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Zone 4b

You may be interested in our other planting guides for Zone 4b.