Before planting it is a good idea to find your USDA Zone info to estimate 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 Walla Walla should be looked at to estimate when to plant napa cabbage.

Planting Calendar for Napa cabbage

Frost tolerance for napa cabbage:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

You can plant napa cabbage a lot earlier in the year because they are very cold tolerant.

The earliest that you can plant napa cabbage in Walla Walla 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 napa cabbage and expect a good harvest is probably September. Any later than that and your napa cabbage may not have a chance to really do well. You can get started a little bit earlier by starting your napa cabbage indoors.

Last Frost Date

The average date of last frost is April 15 in Walla Walla. It might get as low as 0°F during the coldest months of winter.

Always keep in mind that USDA zone info for Walla Walla may not be accurate from year to year and the actual date of last frost changes from year to year. Half of the time in Walla Walla it frosts late in the year after April 15 so make sure that you are prepared to cover your napa cabbage if you have one of those late frosts.

USDA Zone Info for Walla Walla

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Walla Walla

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