Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Port Huron you can determine when to plant thyme by referring to the USDA zone info.

Planting Calendar for Thyme

Frost tolerance for thyme:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Thyme are very cold tolerant which tells us that you can start planting them much earlier than other frost tender plants.

The earliest that you can plant thyme in Port Huron is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant thyme and expect a good harvest is probably September. Any later than that and your thyme may not have a chance to grow to maturity. Starting your thyme indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Port Huron. You can expect an average low temperature of -10°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Port Huron may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Port Huron you get a frost after April 15 so just be sure to be ready to protect your thyme in the event of a surprise 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.