One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of getting a good idea when it's a good idea to plant coreopsis is to refer to the USDA zone info for Ashtabula.

Planting Calendar for Coreopsis

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

Coreopsis are one of those plants that can tolerate a little bit of cold weather which means that you can get them planted earlier than other plants that might not handle the cold.

The earliest that you can plant coreopsis in Ashtabula 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. Starting your coreopsis indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Ashtabula. You should expect an average low temperature of -5°F in the coldest months of winter.

It's important to remember that USDA zone info for Ashtabula is an average and the actual date of last frost will vary from year to year. Half of the time in Ashtabula it frosts late in the year after April 15 so make sure that you are ready to cover your coreopsis in the event of one of those late frosts.

USDA Zone Info for Ashtabula

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 Ashtabula

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