The USDA Zone info is a great tool for gardeners to help us figure out 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.

One way of making a decision about when you can plant coreopsis is to examine the USDA zone info for Princeton.

Planting Calendar for Coreopsis

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

Coreopsis tend to make it in mild cold which means that you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant coreopsis in Princeton 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 fully mature. You can get started a couple of weeks earlier by starting your coreopsis indoors.

Last Frost Date

In Princeton the average date of last frost happens on May 15. In the coldest months of winter you should expect an average low temperature of -30°F.

Keep in mind that USDA zone info for Princeton is not always accurate and the actual date of last frost will vary from year to year. Half of the time in Princeton you get surprised by a frost after May 15 so just be sure to be ready to cover your coreopsis in the event of a surprise late frost.

USDA Zone Info for Princeton

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 Princeton

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