One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first chance to plant spinach in Port Huron can be figured out by reviewing the USDA zone info.

Planting Calendar for Spinach

Frost tolerance for spinach:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since spinach are moderately cold tolerant you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant spinach 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 spinach and expect a good harvest is probably September. Any later than that and your spinach may not have a chance to fully mature. Starting your spinach indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Port Huron. It might get as low as -10°F during the coldest months of winter.

Always keep in mind 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. Half of the time in Port Huron you get surprised by a frost after April 15 so make sure that you are prepared to protect your spinach in the event of one of those late frosts.

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.