The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of getting a good idea when it's the best time to plant hibiscus is to refer to the USDA zone info for Port Huron.

Planting Calendar for Hibiscus

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

It's a bad idea to plant hibiscus until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant hibiscus in Port Huron 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. You probably don't want to wait any later than that or else your hibiscus may not have a chance to fully mature. Starting your hibiscus indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost has passed is on April 15 in Port Huron. In the coldest months of winter you can expect an average low temperature of -10°F.

Just be sure to remember that USDA zone info for Port Huron is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in Port Huron it frosts late in the year after April 15 be ready to protect your hibiscus if you have a late frost.

USDA Zone Info for Port Huron

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Port Huron

You may be interested in your other planting guides for Port Huron.