One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. 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 determining when it's possible to plant delphinium is to look at the USDA zone info for Jonesborough.

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 do ok in very little cold which means that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant delphinium in Jonesborough 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 grow to maturity. Starting your delphinium indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Jonesborough. In the coldest months of winter you should expect an average low temperature of 0°F.

Since the USDA zone info for Jonesborough may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Jonesborough it frosts late in the year after April 15 so just be sure to be ready to cover your delphinium if you have a late frost.

USDA Zone Info for Jonesborough

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 Jonesborough

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