One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. 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 it's a good idea to plant primula is to examine the USDA zone info for Cornelius.

Planting Calendar for Primula

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

You can plant primula a lot earlier in the year because they are one of those plants that can tolerate quite a bit of cold weather.

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

Last Frost Date

On average all chance of frost has passed is on April 15 in Cornelius. In the coldest months of winter you should expect an average low temperature of 5°F.

Remember that the actual date of last frost is just an average because it is based on the USDA zone info for Cornelius and it changes from year to year. Since half of the time in Cornelius you get surprised by a frost after April 15 be ready to cover your primula in the event of one of those late frosts.

USDA Zone Info for Cornelius

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 Cornelius

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