Before planting it is a good idea to find your USDA Zone info to determine 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.

In Charlestown you can figure out when it's possible to plant dianthus by using the USDA zone info.

Planting Calendar for Dianthus

Frost tolerance for dianthus:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Dianthus do well in moderate cold which tells us that you can get them planted earlier than other plants that might not handle the cold.

The earliest that you can plant dianthus in Charlestown is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant dianthus and expect a good harvest is probably September. Any later than that and your dianthus may not have a chance to fully mature. You can get started a little bit earlier by starting your dianthus indoors.

Last Frost Date

The average date of last frost is April 15 in Charlestown. You can expect an average low temperature of -5°F in the coldest months of winter.

Keep in mind that USDA zone info for Charlestown is not always accurate and the actual date of last frost is different every year. Half of the time in Charlestown it frosts late in the year after April 15 so make sure that you are ready to cover your dianthus in the event of a late frost.

USDA Zone Info for Charlestown

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Charlestown

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