The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Trinity you can determine when it's possible to plant achillea by using the USDA zone info.

Planting Calendar for Achillea

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

Achillea are very cold tolerant which means that you can plant them a quite a bit earlier than other frost tender plants.

The earliest that you can plant achillea in Trinity 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. Any later than that and your achillea may not have a chance to fully mature. If you are starting your achillea indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost has passed is on April 15 in Trinity. You should expect an average low temperature of 5°F in the coldest months of winter.

Keep in mind that USDA zone info for Trinity may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in Trinity you get surprised by a frost after April 15 be ready to cover your achillea if you have a late frost.

USDA Zone Info for Trinity

Here is the info for USDA Zone 7b.

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

Plants to Grow in Trinity

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