When can I plant Hardy Hibiscus in Zone 1a

One of the first steps we take when we are figuring out our gardening schedule is find our USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

By referring to the USDA zone info for Zone 1a you should be able to figure out when it's a good idea to plant hardy hibiscus.


Planting Calendar for Hardy Hibiscus

Frost tolerance for hardy hibiscus: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

You can plant hardy hibiscus a lot earlier in the year because they do well in cold.

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

The earliest that you can plant hardy hibiscus in Zone 1a is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant hardy hibiscus and expect a good harvest is probably July. You probably don't want to wait any later than that or else your hardy hibiscus may not have a chance to grow to maturity. If you are starting your hardy hibiscus indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on June 15 in Zone 1a. We can expect an average low temperature of -60°F in the coldest months of winter.

Since the USDA zone info for Zone 1a is just an average our actual date of last frost can change quite a bit from year to year. Half of the time in Zone 1a we get a frost after June 15 so be sure to be ready to protect your hardy hibiscus in the event of one of those late frosts.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-60°F
Highest Expected Low-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in our other planting guides for Zone 1a.