The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Commerce City you can determine when you can plant bok choi by checking out the USDA zone info.

Planting Calendar for Bok Choi

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

You can plant bok choi a bit earlier in the year because they do well in moderate cold.

The earliest that you can plant bok choi in Commerce City 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 bok choi and expect a good harvest is probably September. You probably don't want to wait any later than that or else your bok choi may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your bok choi indoors.

Last Frost Date

On average the last frost is on April 15 in Commerce City. It might get as low as -15°F during the coldest months of winter.

Since the USDA zone info for Commerce City is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Commerce City there is a last frost after April 15 so make sure that you are ready to cover your bok choi in the event of a late frost.

USDA Zone Info for Commerce City

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 Commerce City

You may be interested in your other planting guides for Commerce City.