One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant sorrel in Umatilla can be determined by referring to the USDA zone info.

Planting Calendar for Sorrel

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

Sorrel do well in moderate cold which tells us that you can plant them earlier than more sensitive plants.

The earliest that you can plant sorrel in Umatilla 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 really do well. Starting your sorrel 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 Umatilla. You should expect an average low temperature of 5°F in the coldest months of winter.

It's important to remember that USDA zone info for Umatilla is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Umatilla last frost occurs after April 15 be ready to protect your sorrel in the event of a late frost.

USDA Zone Info for Umatilla

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°F

This means that on a really cold year, the coldest it will get is 5°F. On most years you should be prepared to experience lows near 10°F.

Plants to Grow in Umatilla

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