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 best time to plant hibiscus in Zone 5b can be estimated by checking out the USDA zone info.

Planting Calendar for Hibiscus

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

Since hibiscus require warm weather it's important to wait until after the last frost before you can plant them.

The earliest that you can plant hibiscus in Zone 5b 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 hibiscus and expect a good harvest is probably August. Any later than that and your hibiscus may not have a chance to grow to maturity. If you are starting your hibiscus indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on April 15 in Zone 5b. In the coldest months of winter you should expect an average low temperature of -15°F.

Always keep in mind that USDA zone info for Zone 5b may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Zone 5b last frost occurs after April 15 so make sure that you are ready to protect your hibiscus if you have a late frost.

USDA Zone Info for Zone 5b

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 Zone 5b

You may be interested in your other planting guides for Zone 5b.