The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first chance to plant delphinium in Dearborn Heights should be figured out by checking out the USDA zone info.

Planting Calendar for Delphinium

Frost tolerance for delphinium:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Delphinium can survive in very little cold which means that you can plant them slightly earlier in the year than other plants that might not handle the cold.

The earliest that you can plant delphinium in Dearborn Heights 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 delphinium and expect a good harvest is probably August. If you wait any later than that and your delphinium may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your delphinium indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Dearborn Heights. You should expect an average low temperature of -10°F in the coldest months of winter.

Since the USDA zone info for Dearborn Heights may not be accurate from year to year the actual date of last frost changes from year to year. Since half of the time in Dearborn Heights it frosts late in the year after April 15 be ready to cover your delphinium if you have a surprise late frost.

USDA Zone Info for Dearborn Heights

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Dearborn Heights

You may be interested in your other planting guides for Dearborn Heights.