Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Ellensburg you can determine when it's the best time to plant armeria by referring to the USDA zone info.

Planting Calendar for Armeria

Frost tolerance for armeria:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Armeria are very cold tolerant which tells us that you can plant them much earlier than other frost tender plants.

The earliest that you can plant armeria in Ellensburg 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 armeria and expect a good harvest is probably September. If you wait any later than that and your armeria may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your armeria indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Ellensburg. You should expect an average low temperature of -5°F in the coldest months of winter.

Since the USDA zone info for Ellensburg may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Ellensburg you get surprised by a frost after April 15 so always be ready to cover your armeria in the event of a late frost.

USDA Zone Info for Ellensburg

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 Ellensburg

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