When can I plant Dianthus in Zone 1a

The USDA Zone info is a great tool for gardeners to help us estimate 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.

The first chance to plant dianthus in Zone 1a should be determined by using the USDA zone info.


Planting Calendar for Dianthus

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

Dianthus do well in some cold which means that you can plant them a bit earlier in the year than other frost tender plants.

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

The earliest that you can plant dianthus in Zone 1a 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 dianthus and expect a good harvest is probably July. If you wait any later than that and your dianthus may not have a chance to grow to maturity. Starting your dianthus indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on June 15 in Zone 1a. In the coldest months of winter we can expect an average low temperature of -60°F.

Since the USDA zone info for Zone 1a is an average our actual date of last frost is different every year. Half of the time in Zone 1a we get a frost after June 15 so make sure that you are prepared to cover your dianthus in the event of one of those late frosts.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-60°F
Highest Expected Low-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in our other planting guides for Zone 1a.