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 Nampa you can estimate when it's a good idea to plant yarrow by looking at the USDA zone info.

Planting Calendar for Yarrow

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

You can plant yarrow earlier in the year because they do well in cold.

The earliest that you can plant yarrow in Nampa 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. If you wait any later than that and your yarrow may not have a chance to grow to maturity. You can get started a little bit earlier by starting your yarrow indoors.

Last Frost Date

On average the last frost is on April 15 in Nampa. In the coldest months of winter you should expect an average low temperature of 0°F.

Since the USDA zone info for Nampa may not be accurate from year to year the actual date of last frost will vary from year to year. Half of the time in Nampa there is a last frost after April 15 so make sure that you are ready to protect your yarrow if you have one of those late frosts.

USDA Zone Info for Nampa

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Nampa

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