One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. 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 determining when to plant yarrow is to use the USDA zone info for Bellevue.

Planting Calendar for Yarrow

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

Since yarrow are one of those plants that can tolerate quite a bit of cold weather you can plant them a lot earlier in the year than other plants that might not handle the cold.

The earliest that you can plant yarrow in Bellevue 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 yarrow and expect a good harvest is probably September. Any later than that and your yarrow may not have a chance to really do well. You can get started a few weeks earlier by starting your yarrow indoors.

Last Frost Date

On average the last frost is on April 15 in Bellevue. In the coldest months of winter you can expect an average low temperature of -5°F.

Since the USDA zone info for Bellevue is not always accurate the actual date of last frost will vary from year to year. Half of the time in Bellevue you get surprised by a frost after April 15 so make sure that you are prepared to cover your yarrow in the event of a surprise late frost.

USDA Zone Info for Bellevue

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 Bellevue

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