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

The earliest that you can plant yarrow in Spring Hill should be determined by using 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.

Yarrow are very cold tolerant which tells us that you can plant them a quite a bit earlier than other plants that might not handle the cold.

The earliest that you can plant yarrow in Spring Hill 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 fully mature. 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 Spring Hill. In the coldest months of winter you should expect an average low temperature of -10°F.

It's important to remember that USDA zone info for Spring Hill is not always accurate and the actual date of last frost will vary from year to year. Since half of the time in Spring Hill last frost occurs after April 15 be ready to cover your yarrow if you have a surprise late frost.

USDA Zone Info for Spring Hill

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Spring Hill

You may be interested in your other planting guides for Spring Hill.