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

You should be able to estimate when to plant spinach by referring to the USDA zone info for Princeton.

Planting Calendar for Spinach

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

Since spinach do well in moderate cold you can plant them a little bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant spinach in Princeton is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant spinach and expect a good harvest is probably August. If you wait any later than that and your spinach may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your spinach indoors.

Last Frost Date

The average date of last frost is May 15 in Princeton. You can expect an average low temperature of -30°F in the coldest months of winter.

Keep in mind that USDA zone info for Princeton is just an average and the actual date of last frost changes from year to year. Half of the time in Princeton you get a frost after May 15 so make sure that you are ready to cover your spinach if you have one of those late frosts.

USDA Zone Info for Princeton

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Princeton

You may be interested in your other planting guides for Princeton.