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.

The USDA zone info for Cambridge can be used to estimate when it's the best time to plant sorrel.

Planting Calendar for Sorrel

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

Sorrel are moderately cold tolerant which tells us that you can get them planted earlier than other frost tender plants.

The earliest that you can plant sorrel in Cambridge 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 sorrel and expect a good harvest is probably August. Any later than that and your sorrel may not have a chance to fully mature. If you are starting your sorrel indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Cambridge the average date of last frost happens on May 15. In the coldest months of winter you should expect an average low temperature of -30°F.

Remember that the actual date of last frost is an average because it is based on the USDA zone info for Cambridge and it changes from year to year. Since half of the time in Cambridge there is a last frost after May 15 be ready to cover your sorrel if you have one of those late frosts.

USDA Zone Info for Cambridge

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 Cambridge

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