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

One way of determining when to plant calendula is to consult the USDA zone info for Walnut Ridge.

Planting Calendar for Calendula

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

Calendula are one of those plants that can tolerate a little bit of cold weather which means that you can plant them a little bit earlier than more sensitive plants.

The earliest that you can plant calendula in Walnut Ridge 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 calendula and expect a good harvest is probably September. You probably don't want to wait any later than that or else your calendula may not have a chance to fully mature. You can get started a few weeks earlier by starting your calendula indoors.

Last Frost Date

On average the last frost is on April 15 in Walnut Ridge. You should expect an average low temperature of 5°F in the coldest months of winter.

Since the USDA zone info for Walnut Ridge is not always accurate the actual date of last frost changes from year to year. Half of the time in Walnut Ridge you get a frost after April 15 so always be ready to protect your calendula if you have a late frost.

USDA Zone Info for Walnut Ridge

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 Walnut Ridge

You may be interested in your other planting guides for Walnut Ridge.