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.

You should be able to determine when you can plant scarlet runner beans by looking at the USDA zone info for Harrisburg.

Planting Calendar for Scarlet Runner Beans

Frost tolerance for scarlet runner beans:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

You can not plant scarlet runner beans until after the last frost because they require warm weather.

The earliest that you can plant scarlet runner beans 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 scarlet runner beans and expect a good harvest is probably August. If you wait any later than that and your scarlet runner beans may not have a chance to really do well. You can get started a little bit earlier by starting your scarlet runner beans indoors.

Last Frost Date

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

Always keep in mind that USDA zone info for Harrisburg is an average and the actual date of last frost changes from year to year. Half of the time in Harrisburg you get surprised by a frost after April 15 so just be sure to be ready to protect your scarlet runner beans if you have one of those late frosts.

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.