Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of determining when to plant garden cress is to refer to the USDA zone info for Ketchikan.

Planting Calendar for Garden cress

Frost tolerance for garden cress:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since garden cress are not cold tolerant it's necessary to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant garden cress in Ketchikan is April. However, you really should wait until May if you don't want to take any chances.

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

Last Frost Date

On average the last frost has passed is on April 15 in Ketchikan. In the coldest months of winter you can expect an average low temperature of 5°F.

Keep in mind that USDA zone info for Ketchikan is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Ketchikan it frosts late in the year after April 15 so always be ready to cover your garden cress in the event of one of those late frosts.

USDA Zone Info for Ketchikan

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 Ketchikan

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