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

The best time to plant alternaria in Harrisburg can be figured out by using the USDA zone info.

Planting Calendar for Alternaria

Frost tolerance for alternaria:	Not tolerant of frost.
When to plant:	After the last frost.

You can not plant alternaria until after the last frost because they are not cold tolerant.

The earliest that you can plant alternaria in Harrisburg is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant alternaria and expect a good harvest is probably August. You probably don't want to wait any later than that or else your alternaria may not have a chance to really do well. You can get started a few weeks earlier by starting your alternaria indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Harrisburg. You can expect an average low temperature of 0°F in the coldest months of winter.

Since the USDA zone info for Harrisburg is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Harrisburg you get a frost after April 15 so make sure that you are prepared to protect your alternaria in the event of a late frost.

USDA Zone Info for Harrisburg

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 Harrisburg

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