When can I plant Hypericum in Zone 4a

One of the best tools that we have as gardeners to help us figure out our 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 our area.

You will be able to estimate when it's possible to plant hypericum by looking at the USDA zone info for Zone 4a.


Planting Calendar for Hypericum

Frost tolerance for hypericum: Tolerant of a very small amount of frost.
When you should plant them: Up to 3 weeks before last frost.

Hypericum can survive in very little cold which means that you can plant them slightly earlier in the year than other frost tender plants.

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

The earliest that you can plant hypericum in Zone 4a 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 hypericum and expect a good harvest is probably August. You probably don't want to wait any later than that or else your hypericum may not have a chance to grow to maturity. You can get started a little bit earlier by starting your hypericum indoors.

Last Frost Date

In Zone 4a the average date of last frost happens on May 15. In the coldest months of winter we can expect an average low temperature of -30°F.

It's important to remember that our actual date of last frost is an average because it is based on the USDA zone info for Zone 4a and it can change quite a bit from year to year. Since half of the time in Zone 4a we get a frost after May 15 be ready to protect your hypericum if we have a late frost.

USDA Zone Info for Zone 4a

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-30°F
Highest Expected Low-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Zone 4a

You may be interested in our other planting guides for Zone 4a.