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.

You should be able to figure out when to plant purple rock cress by looking at the USDA zone info for Soldotna.

Planting Calendar for Purple Rock Cress

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

Purple Rock Cress are very cold tolerant which means that you can plant them a quite a bit earlier than plants that are more sensitive to the cold.

The earliest that you can plant purple rock cress in Soldotna is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant purple rock cress and expect a good harvest is probably August. If you wait any later than that and your purple rock cress may not have a chance to fully mature. You can get started a little bit earlier by starting your purple rock cress indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Soldotna. It might get as low as -30°F during the coldest months of winter.

Since the USDA zone info for Soldotna is not always accurate the actual date of last frost is different every year. Half of the time in Soldotna it frosts late in the year after May 15 so just be sure to be ready to protect your purple rock cress in the event of a late frost.

USDA Zone Info for Soldotna

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Soldotna

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