One of the first steps you take when you are figuring out your gardening schedule is find your 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.

A common way of getting a good idea when it's possible to plant coreopsis is to examine the USDA zone info for Ann Arbor.

Planting Calendar for Coreopsis

Frost tolerance for coreopsis:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Coreopsis can survive in moderate cold which means that you can plant them a little bit earlier in the year than more sensitive plants.

The earliest that you can plant coreopsis in Ann Arbor 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 coreopsis and expect a good harvest is probably September. Any later than that and your coreopsis may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your coreopsis indoors.

Last Frost Date

The average date of last frost is April 15 in Ann Arbor. You should expect an average low temperature of -10°F in the coldest months of winter.

Always keep in mind that USDA zone info for Ann Arbor is just an average and the actual date of last frost will vary from year to year. Half of the time in Ann Arbor there is a last frost after April 15 so be sure to be ready to cover your coreopsis if you have a surprise late frost.

USDA Zone Info for Ann Arbor

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 Ann Arbor

You may be interested in your other planting guides for Ann Arbor.