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.

By reviewing the USDA zone info for Orange you should be able to determine when it's possible to plant primula.

Planting Calendar for Primula

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

Primula do well in cold which means that you can plant them much earlier than plants that are more sensitive to the cold.

The earliest that you can plant primula in Orange is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant primula and expect a good harvest is probably October. If you wait any later than that and your primula may not have a chance to really do well. Starting your primula indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Orange the average date of last frost happens on February 15. You can expect an average low temperature of 20°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Orange is not always accurate and the actual date of last frost is different every year. Since half of the time in Orange last frost occurs after February 15 be ready to cover your primula if you have a late frost.

USDA Zone Info for Orange

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

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

Plants to Grow in Orange

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