When can I plant Hibiscus in Zone 3b

Before planting it is a good idea to find our USDA Zone info to estimate our garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

The USDA zone info for Zone 3b should be looked at to determine when it's a good idea to plant hibiscus.


Planting Calendar for Hibiscus

Frost tolerance for hibiscus: Not tolerant of frost.
When you should plant them: After the last frost.

Since hibiscus do not do well in cold weather you must wait until after the last frost when the weather gets warmer before you can plant them.

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

The earliest that you can plant hibiscus in Zone 3b 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 hibiscus and expect a good harvest is probably August. Any later than that and your hibiscus may not have a chance to fully mature. If you are starting your hibiscus indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Zone 3b the average date of last frost happens on May 15. It might get as low as -35°F during the coldest months of winter.

Remember that our actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for Zone 3b and it changes from year to year. Half of the time in Zone 3b we get surprised by a frost after May 15 so make sure that you are ready to cover your hibiscus in the event of one of those late frosts.

USDA Zone Info for Zone 3b

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-35°F
Highest Expected Low-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Zone 3b

You may be interested in our other planting guides for Zone 3b.