The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to estimate when you can plant sorrel by checking out the USDA zone info for Knoxville.

Planting Calendar for Sorrel

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

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

The earliest that you can plant sorrel in Knoxville 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 sorrel and expect a good harvest is probably September. You probably don't want to wait any later than that or else your sorrel may not have a chance to grow to maturity. You can get started a little bit earlier by starting your sorrel indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Knoxville. It might get as low as -15°F during the coldest months of winter.

Remember that USDA zone info for Knoxville is just an average and the actual date of last frost changes from year to year. Half of the time in Knoxville you get a frost after April 15 so make sure that you are ready to cover your sorrel in the event of one of those late frosts.

USDA Zone Info for Knoxville

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Knoxville

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