Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By looking at the USDA zone info for Amherst you should be able to figure out when to plant dipladenia.

Planting Calendar for Dipladenia

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

Dipladenia require warm weather which means that you need to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant dipladenia in Amherst is April. However, you really should wait until May 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. You can get started a few weeks earlier by starting your dipladenia indoors.

Last Frost Date

On average the last frost is on April 15 in Amherst. In the coldest months of winter you should expect an average low temperature of -10°F.

Just be sure to remember that USDA zone info for Amherst is an average and the actual date of last frost is different every year. Since half of the time in Amherst you get surprised by a frost after April 15 be ready to cover your dipladenia if you have one of those late frosts.

USDA Zone Info for Amherst

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Amherst

You may be interested in your other planting guides for Amherst.