One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Oregon City you can figure out when to plant dianthus by checking out 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 are moderately cold tolerant which tells us that you can plant them earlier than other frost tender plants.

The earliest that you can plant dianthus in Oregon City 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 really do well. Starting your dianthus indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is March 15 in Oregon City. It might get as low as 15°F during the coldest months of winter.

Since the USDA zone info for Oregon City is not always accurate the actual date of last frost is different every year. Half of the time in Oregon City you get surprised by a frost after March 15 so be sure to be ready to cover your dianthus in the event of one of those late frosts.

USDA Zone Info for Oregon City

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Oregon City

You may be interested in your other planting guides for Oregon City.