Before planting it is a good idea to find your USDA Zone info to estimate 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.

In New Richmond you can figure out when it's possible to plant purple rock cress by referring to the USDA zone info.

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.

Since purple rock cress are very cold tolerant you can plant them a lot earlier in the year than more sensitive plants.

The earliest that you can plant purple rock cress in New Richmond 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. Any later than that and your purple rock cress may not have a chance to fully mature. Starting your purple rock cress indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In New Richmond the average date of last frost happens on May 15. In the coldest months of winter you should expect an average low temperature of -25°F.

Remember that USDA zone info for New Richmond may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in New Richmond you get surprised by a frost after May 15 so be sure to be ready to protect your purple rock cress if you have a surprise late frost.

USDA Zone Info for New Richmond

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in New Richmond

You may be interested in your other planting guides for New Richmond.