The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of figuring out when it's a good idea to plant dianthus is to consult the USDA zone info for Snohomish.

Planting Calendar for Dianthus

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

Dianthus tend to make it in a little bit of cold which means that you can plant them a bit earlier in the year than more sensitive plants.

The earliest that you can plant dianthus in Snohomish 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. If you wait any later than that and your dianthus may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your dianthus indoors.

Last Frost Date

On average all chance of frost has passed is on March 15 in Snohomish. In the coldest months of winter you should expect an average low temperature of 15°F.

Since the USDA zone info for Snohomish is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Snohomish you get surprised by a frost after March 15 so make sure that you are prepared to protect your dianthus if you have one of those late frosts.

USDA Zone Info for Snohomish

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 Snohomish

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