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.

One way of making a decision about when it's the best time to plant centaurea is to use the USDA zone info for Rahway.

Planting Calendar for Centaurea

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

Centaurea tend to make it in mild cold which tells us that you can plant them just a bit earlier in the year than more sensitive plants.

The earliest that you can plant centaurea in Rahway 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 centaurea and expect a good harvest is probably September. You probably don't want to wait any later than that or else your centaurea may not have a chance to fully mature. You can get started a few weeks earlier by starting your centaurea indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Rahway. In the coldest months of winter you can expect an average low temperature of 0°F.

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

USDA Zone Info for Rahway

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Rahway

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