The USDA Zone info is a great tool for gardeners to help us estimate 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 Rochester you can figure out when it's the best time to plant coreopsis by checking out 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.

Since coreopsis do well in moderate cold you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant coreopsis in Rochester 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. Any later than that and your coreopsis may not have a chance to really do well. Starting your coreopsis indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is May 15 in Rochester. You can expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Rochester is not always accurate the actual date of last frost is different every year. Since half of the time in Rochester you get a frost after May 15 be ready to cover your coreopsis in the event of a surprise late frost.

USDA Zone Info for Rochester

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Rochester

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