When to Plant Achillea in Washington, IL

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

One way of making a decision about when it's possible to plant achillea is to use the USDA zone info for Washington.


Planting Calendar for Achillea

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

Achillea do ok in quite a bit of cold which tells us that you can plant them much earlier in the year than plants that are more sensitive to the cold.

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

The earliest that you can plant achillea in Washington 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 achillea and expect a good harvest is probably September. If you wait any later than that and your achillea may not have a chance to really do well. If you are starting your achillea indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Washington. You should expect an average low temperature of -15°F in the coldest months of winter.

It's important to remember that USDA zone info for Washington is an average and the actual date of last frost will vary from year to year. Half of the time in Washington you get surprised by a frost after April 15 so always be ready to protect your achillea in the event of a surprise late frost.

USDA Zone Info for Washington

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-15°F
Highest Expected Low-10°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 -10°F.

Plants to Grow in Washington

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