When can I plant Rock Cress in Zone 8b

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

The first opportunity to plant rock cress in Zone 8b can be estimated by looking at the USDA zone info.


Planting Calendar for Rock Cress

Frost tolerance for rock cress: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

You can plant rock cress much earlier in the year because they are very cold tolerant.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant rock cress
Possibly ok, but a risky time to plant rock cress
Probably not a good time to plant rock cress

The earliest that you can plant rock cress in Zone 8b 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 rock cress and expect a good harvest is probably September. If you wait any later than that and your rock cress may not have a chance to grow to maturity. If you are starting your rock cress indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Zone 8b the average date of last frost happens on March 15. In the coldest months of winter we should expect an average low temperature of 15°F.

Since the USDA zone info for Zone 8b may not be accurate from year to year our actual date of last frost will vary from year to year. Half of the time in Zone 8b it frosts late in the year after March 15 so be sure to be ready to protect your rock cress if we have a surprise late frost.

USDA Zone Info for Zone 8b

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)March 15
Average Date of First Frost (fall)November 15
Lowest Expected Low15°F
Highest Expected Low20°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 20°F.

Plants to Grow in Zone 8b

You may be interested in our other planting guides for Zone 8b.