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

In Cambridge you can determine when you can plant coreopsis by reviewing the USDA zone info.

Planting Calendar for Coreopsis

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

Coreopsis do ok in moderate cold which means that you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant coreopsis in Cambridge is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant coreopsis and expect a good harvest is probably August. You probably don't want to wait any later than that or else your coreopsis may not have a chance to grow to maturity. You can get started a little bit earlier by starting your coreopsis indoors.

Last Frost Date

On average the last frost is on May 15 in Cambridge. In the coldest months of winter you can expect an average low temperature of -30°F.

Since the USDA zone info for Cambridge is not always accurate the actual date of last frost can change quite a bit from year to year. Since half of the time in Cambridge there is a last frost after May 15 be ready to cover your coreopsis in the event of a surprise late frost.

USDA Zone Info for Cambridge

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Cambridge

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