One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Chambersburg should be used to estimate when it's the best time to plant skullcap.

Planting Calendar for Skullcap

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

It's probably a bad idea to plant skullcap until after the last frost because they do not do well in cold weather.

The earliest that you can plant skullcap in Chambersburg 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 skullcap and expect a good harvest is probably August. If you wait any later than that and your skullcap may not have a chance to fully mature. If you are starting your skullcap indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Chambersburg. It might get as low as -5°F during the coldest months of winter.

Since the USDA zone info for Chambersburg is an average the actual date of last frost changes from year to year. Since half of the time in Chambersburg there is a last frost after April 15 be ready to protect your skullcap if you have one of those late frosts.

USDA Zone Info for Chambersburg

Here is the info for USDA Zone 6b.

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

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

Plants to Grow in Chambersburg

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