When to Plant Skullcap in Harvard, IL

Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant skullcap in Harvard can be determined by using the USDA zone info.

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Planting Calendar for Skullcap

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

Since skullcap require warm weather it is necessary to wait until after the last frost before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant skullcap
Possibly ok, but a risky time to plant skullcap
Probably not a good time to plant skullcap

The earliest that you can plant skullcap in Harvard 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. You can get started a couple of weeks earlier by starting your skullcap indoors.

Last Frost Date

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

Just be sure to remember that the actual date of last frost is an average because it is based on the USDA zone info for Harvard and it can change quite a bit from year to year. Half of the time in Harvard you get surprised by a frost after April 15 so make sure that you are ready to protect your skullcap if you have a late frost.

USDA Zone Info for Harvard

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Harvard

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